The math quiz scores show that µ=75 and σ=10. What quiz score is three standard deviations...

Question

Question

The math quiz scores show that µ=75 and σ=10. What quiz score is three standard deviations below the mean?

Answer 1

Answer #1

We have to calculate X such that score is 3 standard deviation below the mean.

That is z-score = -3

z-score = X - /

-3 = X - 75 / 10

X - 75 = -30

X = 45

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Answer 2

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