On a nationwide math test, the mean was 69 and the standard deviation was 7. If...

Question

Question

On a nationwide math test, the mean was 69 and the standard deviation was 7. If Roberto scored 85, what was his z-score?

math Statistics-And-Probability

Answer 1

Answer #1

Solution :

Given that ,

mean = = 69

standard deviation = = 7

x = 85

Using z-score formula,

z = x - /

z = 85 - 69 / 7

z = 2.29

Answer 2

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