2. Suppose that the amount of protein in certain type of energy bar is Normally Distributed with a mean of 8.5 grams with a standard deviation of 0.45 grams. Suppose that a random bar of this type is selected.

2. Suppose that the amount of protein in certain type of energy bar is Normally Distributed with a mean of 8.5 grams with a standard deviation of 0.45 grams. Suppose that a random bar of this type is selected.

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.2: Expected Value And Variance Of Continuous Random Variables

Problem 10E

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Question

2. Suppose that the amount of protein in certain type of energy bar is Normally
Distributed with a mean of 8.5 grams with a standard deviation of 0.45 grams.
Suppose that a random bar of this type is selected.

d. Find the 90th percentile of the grams of protein in these bars.
e. Find the values v and w such that the middle 90% of protein amounts fall
between v and w.

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For part d, I see how you get the final answer with excel, but what I'm not understanding is the steps leading up to that answer. Specifically, where does the 1.282 comes from and how do you use the table to obtain that value because I'm not getting the same value.

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