Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 23.9 months. The standard deviation is 2.9 months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.8 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population, and the correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator. Round your answer to at least four decimal places. P(X<23.8)=|

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Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 23.9 months. The standard deviation is 2.9
months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be
less than 23.8 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population, and the
correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator. Round your answer to at least four decimal places.
P(X<23.8)=
Transcribed Image Text:Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 23.9 months. The standard deviation is 2.9 months. If a company provides its 33 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.8 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population, and the correction factor can be ignored. Use a TI-83 Plus/TI-84 Plus calculator. Round your answer to at least four decimal places. P(X<23.8)=
Police Academy Acceptance Exams In order to qualify for a police academy, applicants are given a test of physical fitness. The scores
are normally distributed with a mean of 62 and a standard deviation of 12. If only the top 20% of the applicants are selected, find the
cutoff score. Use a graphing calculator and round the answer to the nearest whole number.
The cutoff score for the top 20% of the scores is
Transcribed Image Text:Police Academy Acceptance Exams In order to qualify for a police academy, applicants are given a test of physical fitness. The scores are normally distributed with a mean of 62 and a standard deviation of 12. If only the top 20% of the applicants are selected, find the cutoff score. Use a graphing calculator and round the answer to the nearest whole number. The cutoff score for the top 20% of the scores is
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