A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.2 years, and standard devia

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A Manufacturer Knows That Their Items Have A Normally Distributed Lifespan With A Mean Of 9 2 Years And Standard Devia 1 (52.6 KiB) Viewed 9 times

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 9.2 years, and standard deviation of 1.4 years. If you randomly purchase 25 items, what is the probability that their mean life will be longer than 9 years? P(Z > 9) = Submit Question Question 6 0/2 pts 32 Details A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 23 weeks. Assume that for the population of all unemployed individuals the population mean length of unemployment is 23 weeks and that the population standard deviation is 8.9 weeks. Suppose you would like to select a random sample of 175 unemployed individuals for a follow-up study. Find the probability that a single randomly selected value is between 21.4 and 24.6. P(21.4 < x < 24.6) = Find the probability that a sample of size n = 175 is randomly selected with a mean between 21.4 and 24.6. P(21.4 << 24.6) = Enter your answers as numbers accurate to 4 decimal places.