Yahoo Answers: Answers and Comments for Can someone please help me with this standard deviation problem? [Mathematics]
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From Bethany
enUS
Sat, 21 Sep 2019 05:15:47 +0000
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Yahoo Answers: Answers and Comments for Can someone please help me with this standard deviation problem? [Mathematics]
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From Puzzling: A zscore of ±2.17 will result in 97% of the d...
https://answers.yahoo.com/question/index?qid=20190921051547AA0SORw
https://answers.yahoo.com/question/index?qid=20190921051547AA0SORw
Sat, 21 Sep 2019 06:46:35 +0000
A zscore of ±2.17 will result in 97% of the data being within that range (leaving 1.5% on either end).
So just turn those back into raw scores.
x = μ ± zσ
x = 6.9 ± 2.17 * 1
6.9  2.17 = 4.73
6.9 + 2.17 = 9.07
Answer:
4.73 ≤ x ≤ 9.07

From Bethany: Sorry. Didn't post right. Here is the que...
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https://answers.yahoo.com/question/index?qid=20190921051547AA0SORw
Sat, 21 Sep 2019 05:16:18 +0000
Sorry. Didn't post right. Here is the question.
Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.9in and a standard deviation of 1in. Due to financial constraints, the helmets will be designed to fit all men except those with head breadths that are in the smallest 1.5% or largest 1.5%.
What is the minimum head breadth that will fit the clientele?
min =
What is the maximum head breadth that will fit the clientele?
min =