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AP Statistics/Unit 1: Exploring One-Variable Data
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Standard Deviation From Normal Distribution Probabilities

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For a normally distributed variable, the probability of observing a value less than 72 is 0.65, and the probability of observing a value less than 58 is 0.20. What is the standard deviation of the distribution?

A

9.8

B

14.0

C

11.2

D

11.4

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