Question

Raul received a score of 70 on a history test for which the class mean was 70 with a standard deviation of 4. He received a score of 79 on a biology test for which the class mean was 70 with standard deviation 7. On which test did he do better relative to the rest of the class?

Answer 1

change to z score
z = (x - mu ) / sigma
for the first test we have z = ( 70 - 70)/4=0
second test we have z = (79-70)/7 =1.285
so he did better on the second test

Answer 2

relative to the rest of the class
q