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

993

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
`*` 30

`\mu` = 1023 - 30

`\mu` = 993