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Normal Distribution · Question 30 of 68

Question 30

EasyOriginal question

About what percentage of a normal distribution lies more than 2 standard deviations from the mean, on either side?

Options for question 30

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. About 95% lies within 2 standard deviations of the mean.

  2. So about 100%−95%=5%100\% - 95\% = 5\% lies beyond, split between the two tails.

Worth noting

2.5% is one tail only; 'either side' counts both.

Concept
The 68, 95 and 99.7 per cent rule
Typical time
60 s
Your time
—
The rule this testsAreas under the curve
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Ten questions from Normal Distribution, at your own pace.

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