Answers
The z-score for X = 53.5 is
The z-score for X = 54.5 is
The percent of the cell phone cases meet manufacturing specifications is
Answer: 83.14%
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The z-score for X = 53.5 is
The z-score for X = 54.5 is
The percent of the cell phone cases meet manufacturing specifications is
Answer: 90.15%
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Here we need z-scores that have 0.95 area between them. The z-scores +/- 1.96 have 0.95 area between them. So
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P(53.5 < X < 54.5)-P(-1.67 < < 1.67) 0.9015
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