this statistics question

label Statistics
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assume the random variable x is distributed with a mean of p=87and standard deviation a=5 find the probability P(x<85)

Oct 21st, 2017

Thank you for the opportunity to help you with your question!

The answer is 0.2266.

1. Find the z-score for 85. 
(85-87)/5 = 0.4.

2. Find P(Z < 0.4) = 0.7734.

3. Subtract this from 1.
1 - 0.7734 = 0.2266.


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Jun 22nd, 2015

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Oct 21st, 2017
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Oct 22nd, 2017
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