Thirty runners compete in a cross-country race. Your school hat five runners in

Question

Thirty runners compete in a cross-country race. Your school hat five runners in the race. What Is the probability that three runners from your school place first, second, and third? Sixty-eight percent of adults would still consider a car brand despite product/safety recalls. You randomly select 20 adults. Find the probability that the number of adults who would still consider a car brand despite product/safety recalls is: Exactly one; More than one; At most one The mean annual salary for flight attendants b about $65,700. A random sample of 48 flight attendants is selected from this population. What is the probability that the mean annual salary of the sample is less than $63,400? Assume sigma = $14,500. The weekly time spent (in hours) on homework for 18 randomly selected high school students are: Find the sample mean. Find the sample standard deviation Construct a 99% confidence interval for the population mean. Assume the population is normally distributed.

Explanation / Answer

2. Total number of ways in which first, second and third places can be won by 30 runners = 30P3 = 30!/(30-3)! = 24360

number of ways in which first, second and third places can be won by the 5 students from my school = 5P3 = 60

P(three runners from your school are placed first, second and third) = 60/24360 = 0.0025

P.S - Please post the remaining questions separately

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