A 7 min read Picture this: You’re halfway through a Two-Part Analysis question, making solid progress, when suddenly you realize you’ve been solving the wrong problem entirely. Or worse—you had the right approach,...

A 3 min read Of the people who donated money to a certain local theater last year, 1/4 donated $20 or less and 2/3 donated more than $20 but less than $1,000. If the average (arithmetic mean) amount donated by the people who...