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Normal Distribution · Question 54 of 68

Question 54

MediumOriginal question

IQ scores are normal with mean 100 and standard deviation 15. Between which two scores does the middle 95% roughly lie?

Options for question 54

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. About 95% lies within two standard deviations of the mean.

  2. 100±2×15100 \pm 2 \times 15: from 70 to 130.

Worth noting

85 to 115 is one standard deviation each way, about 68%.

Concept
The middle 95%
Typical time
90 s
Your time
—
The rule this testsUsing the normal distribution
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Ten questions from Normal Distribution, at your own pace.

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