<PRE><B>Question 436238</B>
Please show the formula(s) for question given.
Given a normal distribution with a mean of 85 and a sample standard deviation of 15, how much of the data should be in the interval between 55 and 115?  Thank you.
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z(55) = (55-85)/15 = -30/15 = -2
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z(115) = (115-85)/15 = 30/15 = 2
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P(85&lt; x &lt; 115) = P(-2&lt; z &lt; 2) = 0.9545
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Cheers,
Stan H.
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