{"id":3689,"date":"2014-03-17T10:36:22","date_gmt":"2014-03-17T17:36:22","guid":{"rendered":"https:\/\/e-gmat.com\/blogs\/?p=3689"},"modified":"2022-11-09T17:23:20","modified_gmt":"2022-11-09T11:53:20","slug":"compare-mean-and-median-in-20-seconds","status":"publish","type":"post","link":"https:\/\/e-gmat.com\/blogs\/compare-mean-and-median-in-20-seconds\/","title":{"rendered":"Compare Mean and Median in 20 seconds"},"content":{"rendered":"<span class=\"rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">A <\/span> <span class=\"rt-time\">5<\/span> <span class=\"rt-label rt-postfix\">min read <\/span><\/span><p style=\"text-align: center;\"><img loading=\"lazy\" class=\"aligncenter wp-image-3690\" title=\"Picture2\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture2.png\" alt=\"\" width=\"275\" height=\"234\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture2.png 382w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture2-300x255.png 300w\" sizes=\"(max-width: 275px) 100vw, 275px\" \/><\/p>\n<p>In a table analysis question that contains a long list, calculating mean through traditional method takes time. To save time, we will introduce two techniques that will allow you to logically deduce whether mean is greater than or less than the median.<\/p>\n<p>To illustrate my point, let\u2019s review\u00a0OG 13\/#24 question for discussion.<\/p>\n<p>\u2018The table lists data on the 22 earthquakes of magnitude 7 or greater on the Richter Scale during a recent year. Times are given in hours, minutes, and seconds on the 24-hour Greenwich Mean Time (GMT) clock and correspond to standard time at Greenwich, United Kingdom (UK). Latitude, measured in degrees, is 0 at the equator, increases from 0 to 90 proceeding northward to the North Pole, and decreases from 0 to \u201390 proceeding southward to the South Pole. Longitude, also measured in degrees, is 0 at Greenwich, UK, increases from 0 to 180 from west to east in the Eastern Hemisphere, and decreases from 0 to \u2013180 from east to west in the Western Hemisphere.\u2019<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3691 aligncenter\" title=\"Picture3\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture3.png\" alt=\"\" width=\"538\" height=\"476\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture3.png 673w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture3-300x265.png 300w\" sizes=\"(max-width: 538px) 100vw, 538px\" \/><\/p>\n<p>For each of the following statements, select\u00a0Yes\u00a0if the statement is true based on the information provided; otherwise select\u00a0No.<\/p>\n<p style=\"text-align: left;\"><img loading=\"lazy\" class=\"wp-image-3692 aligncenter\" title=\"Picture17\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture17.png\" alt=\"\" width=\"574\" height=\"154\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture17.png 1024w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture17-300x80.png 300w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><\/p>\n<p>The focus of our discussion will be question # 24A.<\/p>\n<h2>STANDARD APPROACH<\/h2>\n<p>\u201cFor the 22 earthquakes; the arithmetic mean of the depths is greater than the median of the depths.\u201d<\/p>\n<p>In mathematical terms:<\/p>\n<p>Is Mean &gt; Median?The question asks us to compare mean and median. Our natural instinct will be to first calculate the mean and then the median.<\/p>\n<p>Mean &#8211;&gt;\u00a0Mean involves handling 22 data points. Summing up all 22 data points and dividing the sum by 22 is quite time-consuming. The mean comes out to be\u00a0112.56.<\/p>\n<p>The median &#8211;&gt;<\/p>\n<ol>\n<li><span style=\"font-size: 13px;\">Median is the value of the middle-most cell of depth column, when data points are arranged in ascending order.\u00a0<\/span><\/li>\n<li><span style=\"font-size: 13px;\">In this dataset, there are 22 elements.<\/span><\/li>\n<li><span style=\"font-size: 13px;\">So middle most value = mean of 11th and 12th values<\/span><\/li>\n<li><span style=\"font-size: 13px;\">Median =<\/span>\u00a0(25+26)\/2\u00a0<span style=\"font-size: 13px;\">= 25.5.\u00a0<\/span><\/li>\n<\/ol>\n<p>Now let\u2019s review the two approaches.<\/p>\n<h3>APPROACH 1 \u2013 \u201cLIMITED SET OBSERVATION\u201d<\/h3>\n<p>Per the approach, we will at first calculate median, since median is less calculation intensive as compared to mean.<\/p>\n<p>Median = 25.5\u00a0(Following the same approach as in \u201cstandard approach\u201d)<\/p>\n<div><\/div>\n<p><img loading=\"lazy\" class=\"wp-image-3693 aligncenter\" title=\"Picture6\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture6.png\" alt=\"\" width=\"523\" height=\"141\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture6.png 871w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture6-300x80.png 300w\" sizes=\"(max-width: 523px) 100vw, 523px\" \/><\/p>\n<p>Mean \u2013<\/p>\n<p>Fundamental principle\u00a0\u2013 In a series of all positive numbers, mean of the series is always greater than the sum of limited data divided by total # of data points in the set<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3694 aligncenter\" title=\"Picture7-e1358872554901\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture7-e1358872554901.png\" alt=\"\" width=\"315\" height=\"145\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture7-e1358872554901.png 450w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture7-e1358872554901-300x138.png 300w\" sizes=\"(max-width: 315px) 100vw, 315px\" \/><\/p>\n<p>When we glance at the dataset, we find that the last value\u00a0641\u00a0is disproportionately high. This implies that mean of the all depths must be greater than 1\/22 times 641. This equals to 1\/22*(641) = 29.136 km. Now, 29.136 km itself is already greater than the median depth (25.5 km), so the actual mean of the depths must be greater than the median of the depths. So we could arrive at the answer without actually calculating the exact mean of the list.<\/p>\n<p>This approach has also been used by OG.<\/p>\n<h3>APPROACH 2: THE SHERLOCK METHOD &#8211; LOGICAL DEDUCTION BY OBSERVATION<\/h3>\n<p>This approach is along the lines of the Approach 1- Limited set Observation approach, but there is no calculation involved. In fact this approach relies on data observation only.<\/p>\n<p>Median-\u00a0Instead of exactly calculating the median, we will make a few observations. After all to find the exact median, we did have to go through some effort (as shown in standard approach). We know that median is the middle most value.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3695 aligncenter\" title=\"Picture8-e1358874827562\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture8-e1358874827562.png\" alt=\"\" width=\"525\" height=\"169\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture8-e1358874827562.png 875w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture8-e1358874827562-300x96.png 300w\" sizes=\"(max-width: 525px) 100vw, 525px\" \/><\/p>\n<p>Just observing this data set, we can be confident that the median will fall between 25 and 31.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3696 aligncenter\" title=\"Picture9\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture9.png\" alt=\"\" width=\"279\" height=\"178\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture9.png 465w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture9-300x191.png 300w\" sizes=\"(max-width: 279px) 100vw, 279px\" \/><br \/>\nMean-\u00a0Let us understand a property of mean in relation to ascending order listed dataset.<\/p>\n<p>The given data set of depth is arranged in ascending order, &amp; bottom cell values are\u00a0disproportionately higher\u00a0than other cell values. As all the data points lay equal importance for mean, this implies that mean will drift towards heavy values.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3697 aligncenter\" title=\"Picture10-e1358874945169\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture10-e1358874945169.png\" alt=\"\" width=\"277\" height=\"178\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture10-e1358874945169.png 461w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture10-e1358874945169-300x193.png 300w\" sizes=\"(max-width: 277px) 100vw, 277px\" \/><br \/>\nSo it is obvious that mean value will be more than the median. In fact it will be much higher than the median value in this specific question.<\/p>\n<p>Just to recollect the question,\u00a0\u201cFor the 22 earthquakes; the arithmetic mean of the depths is greater than the median of the depths.\u201d\u00a0So the answer to the question is\u00a0YES.<\/p>\n<p>The best thing about this approach is that we don\u2019t need to do any calculation. Mere observation of data &amp; use of basic concept is enough to determine the answer.<\/p>\n<p>Table given below presents a few salient features of mean and median.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3698 aligncenter\" title=\"Picture11\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture11.png\" alt=\"\" width=\"613\" height=\"175\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture11.png 1022w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture11-300x85.png 300w\" sizes=\"(max-width: 613px) 100vw, 613px\" \/><\/p>\n<div><\/div>\n<h3>OTHER SCENARIO<\/h3>\n<p>Few top cell values are disproportionately low and bottom cell values are disproportionately high<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3699 aligncenter\" title=\"Picture12-e1358875907875\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture12-e1358875907875.png\" alt=\"\" width=\"465\" height=\"123\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture12-e1358875907875.png 775w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture12-e1358875907875-300x79.png 300w\" sizes=\"(max-width: 465px) 100vw, 465px\" \/><br \/>\nIn this scenario, we cannot infer that the mean is less or more than the median. The top 5 cells\u2019 values will drift the mean towards a lower value, whereas the bottom 4 cells\u2019 values will drift it towards a higher value. So it is difficult to infer by mere observation the way in which the mean will drift more.<\/p>\n<p>So what to do in this scenario?<\/p>\n<p>Well, GMAT is not going to test exactly this kind of scenario. Had this scenario been presented to you in the exam, there would have been some other concept applicable to deduce the answer. GMAT lays more importance on application of concepts than on long calculations.<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-3700 aligncenter\" title=\"Picture18-e1358876675465\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture18-e1358876675465.png\" alt=\"\" width=\"675\" height=\"317\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture18-e1358876675465.png 675w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture18-e1358876675465-300x140.png 300w\" sizes=\"(max-width: 675px) 100vw, 675px\" \/><\/p>\n<h2>EXERCISE QUESTION<\/h2>\n<p>\u201813 students from a school were rated for their proficiency in 4 sports &#8211; higher the rating, more the proficiency. Table Tennis and Basketball scores are out of 100 points, Lawn Tennis scores are out of 20 points, and badminton scores are out of 50 points.\u2019<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3702 aligncenter\" title=\"Picture14\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture141.png\" alt=\"\" width=\"519\" height=\"430\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture141.png 649w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture141-300x248.png 300w\" sizes=\"(max-width: 519px) 100vw, 519px\" \/><\/p>\n<p>For each of the following statements, select\u00a0\u2018Yes\u2019\u00a0if statement is true based solely on the information provided in the table; otherwise select\u00a0\u2018No\u2019.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-3703 aligncenter\" title=\"Picture15\" src=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture15.png\" alt=\"\" width=\"717\" height=\"132\" srcset=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture15.png 1024w, https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Picture15-300x55.png 300w\" sizes=\"(max-width: 717px) 100vw, 717px\" \/><br \/>\nAccess the excel file of this table &#8211; <a href=\"https:\/\/e-gmat.com\/blogs\/wp-content\/uploads\/2014\/03\/Table-2.xlsx\" target=\"_blank\" rel=\"noopener noreferrer\" data-wpel-link=\"internal\">Here<\/a>. Please make sure that you only use sorting feature of Excel, that too in ascending order only.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a table analysis question that contains a long list, calculating mean through traditional method takes time. To save time, we will introduce two techniques that will allow you to logically deduce whether mean is greater than or less than the median. To illustrate my point, let\u2019s review\u00a0OG 13\/#24 question for discussion. \u2018The table lists [&hellip;]<\/p>\n","protected":false},"author":79663,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","ub_ctt_via":""},"categories":[96],"tags":[],"featured_image_src":null,"author_info":{"display_name":"Juhi Gupta","author_link":"https:\/\/e-gmat.com\/blogs\/author\/juhie-gmat-com\/"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.1.1 (Yoast SEO v17.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Compare Mean and Median in 20 seconds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/e-gmat.com\/blogs\/compare-mean-and-median-in-20-seconds\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Compare Mean and Median in 20 seconds\" \/>\n<meta property=\"og:description\" content=\"In a table analysis question that contains a long list, calculating mean through traditional method takes time. 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