SOLUTION: A standardized test has a mean score of 100 and a standard deviation of 15. A. What percentage of people score between 70 and 85? B. What percentage of people score between 100 a

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Question 381657: A standardized test has a mean score of 100 and a standard deviation of 15.
A. What percentage of people score between 70 and 85?
B. What percentage of people score between 100 and 115?
Answer by Fombitz(32388) About Me  (Show Source):
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A standardized test has a mean score of 100 and a standard deviation of 15.
A. What percentage of people score between 70 and 85?
B. What percentage of people score between 100 and 115?
Find the z score
z=%28x-mu%29%2Fsigma
A) z%5B1%5D=%2870-100%29%2F85
z%5B2%5D=%2885-100%29%2F85
P=P%28z%5B2%5D%29-P%28z%5B1%5D%29
.
.
.
B) z%5B3%5D=%28100-100%29%2F85=0
z%5B4%5D=%28115-100%29%2F85
P=P%28z%5B4%5D%29-0.5%29
.
.
.