問題詳情
【題組】77. What was the average gain from PSAT to SAT of students who did NOT participate in thefree personalized improvement practice through Khan Academy?
(A) about 330 points
(B) about 58 points
(C) about 34 points
(D) about 20 points
參考答案
答案：B
難度：困難0.25
統計：A(4),B(2),C(0),D(1),E(0)