# confusing math that i dont understand

Anonymous
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Question description

Jim tree wants to analyze his shipment of trees based on height. He knows the height of the trees is normally distributed so he can use the standard normal distribution. He measures the height of 100 randomly selected trees in his shipment. He finds the mean is 65 inches and the standard deviation is 10 inches.

What percentage of the trees will be between 55 inches and 75 inches Answer in terms of percentage

uoscar
School: Purdue University

The solution is attached (in pdf and doc) format.Please ask me anything you do not understand.

Jim Tree wants to analyze another shipment of Christmas trees based on height. He knows the
height of the trees is normally distributed so he can use the standard normal distribution. He
measures the height of 500 randomly selected trees in his shipment. Next, he calculates the mean
and standard deviation of their heights. The mean is 60 inches and the standard deviation is 12
inches. Now Jim uses the normal distribution table to calculate the number of trees in each of the
distribution.
Standard Deviation
-1 to 0 (48 to 60 inches)
0 to +1 (60 to ππππππ)
+1 to +2 (72 to 84 inches)

Percentage from table
34.1%
ππππππ
ππππππ

Number of trees out of 500
ππππππ
171

Exercise a little patience!!! Letβs revise some concepts quickly.
If a given set of ...

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Anonymous
Outstanding Job!!!!

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