The random variable X is normally distributed. The mean is twice the standard deviation. It is given that P(X> 5.2) = 0.9. Find the standard deviation.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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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QUESTION 3
(1) The random variable X is normally distributed. The mean is twice the
standard deviation. It is given that P(X> 5.2) = 0.9. Find the standard
deviation.
(ii) A normal distribution has mean u and standard deviation o. If 800
observations are taken from this distribution, how many would you
expect to be between u-0 and u +o?
Transcribed Image Text:QUESTION 3 (1) The random variable X is normally distributed. The mean is twice the standard deviation. It is given that P(X> 5.2) = 0.9. Find the standard deviation. (ii) A normal distribution has mean u and standard deviation o. If 800 observations are taken from this distribution, how many would you expect to be between u-0 and u +o?
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