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A random variable, X, has a mean of 50 and standard deviation of 10. Which of the following probabilities is correct for P(30 < X < 70)? Select one or more: A. 0.25 B. 0.68 C. 0.78 D. 0.72

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Estimation

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Question

A random variable, X, has a mean of 50 and standard deviation of 10. Which of the following probabilities is correct for P(30 < X < 70)?

Select one or more:

0.25

0.68

0.78

0.72

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