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# I am interested in seeing how the following questions are solved by actually working the problems out step by step. I have the following answers for...

I am interested in seeing how the following questions are solved by actually working the problems out step by step. I have the following answers for them: a) 32.4% b) 75.19% c) 8.9% d) 5.8 %

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Average/mean = 13.47
Standard deviation = 4.75
a.
We want P(11&lt;X&lt;15) = P[(11-13.47)/4.75 &lt; Z &lt; (15-13.47)/4.75] = P(0.52&lt;Z&lt;0.322105) , where Z = (X-mean)/S.D
So,...

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