Question

On a standardized test the standard deviation is 30 points. Sheena scores 1023. She is told that this is 1 standard deviation above the mean. What is the mean score on the test?
Question 6 options:



1053



1000



993

Answer 1

Answer:

993

Step-by-step explanation:

standard deviation ( $\sigma$) = 30

Sheena scores = 1023 = 1 standard deviation above the mean

which can be written as;

1023 = mean ($\mu$) + 1 $\sigma$

1023 = $\mu$ + 1 $\times$ 30

$\mu$ = 1023 - 30

$\mu$ = 993