Twenty-five students in a class take a test for which the average grade is 75. Then a twenty-sixth student enters the class, takes the same test, and scores 70. The test average grade calculated with 26 students will
A) rise above 75.
B) fall below 75.
C) change from 75 but the direction is unclear.
D) still equal 75.

Question

Quizplus · Accepted Answer

The average falls because the twenty-sixth student's score (70) is below the original average (75), thus lowering the overall average.

Twenty-Five Students in a Class Take a Test for Which