Question

The mean for a given test is 80, and the standard deviation is 10. If Johnny's Z score was -1.5, his actual score on the test was:

a) 65
b) 70
c) 75
d) 85

Answer 1

Johnny's actual score on the test was 65.

Step-by-step explanation:

To find Johnny's actual score on the test, we need to use the formula:

Actual score = Mean + (Z score * Standard deviation)

Given that Johnny's Z score is -1.5, the formula becomes:

Actual score = 80 + (-1.5 * 10)

Calculating the actual score:

Actual score = 80 - 15

Actual score = 65

Therefore, Johnny's actual score on the test was 65.