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Auto insurance premiums. Suppose a newspaper article states that the distribution of auto insurance premiums for residents of California is approximately normal with a mean of $1,650. The article also states that 25% of California residents pay more than $1,800.
(a) What is the Z-score that corresponds to the top 25% (or the 75th percentile) of the standard normal distribution?
(b) What is the mean insurance cost? What is the cutoff for the 75th percentile?
(c) Identify the standard deviation of insurance premiums in LA.
A company tracked the number of complaints it received during the first 6 months of last year, as shown in the following table:
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How do federal policy and Congress play a role in the work place?
assume a normal distribution. draw a well-labeled curve for each part.a. find the z-score that gives a left area
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If we randomly select 20 statistics students, what is the probability that exactly half of them would pass?
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