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Normal Distribution · Question 19 of 68

Question 19

MediumOriginal question

A variable is normal with mean 120 and standard deviation 15. Which value of xx has z=0.8z = 0.8?

Options for question 19

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. x=μ+zσx = \mu + z\sigma.

  2. 120+0.8×15=132120 + 0.8 \times 15 = 132.

Worth noting

108 goes 0.8 standard deviations below the mean; zz is positive.

Concept
From z back to x
Typical time
90 s
Your time
—
The rule this testsThe standard normal variate
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Ten questions from Normal Distribution, at your own pace.

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Ten questions from Normal Distribution, at your own pace.

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