A ferry boat leaves the dock once per hour. Your waiting time for the next ferryboat will follow a uniform distribution from 0 to 60 minutes. a. Find the mean and variance of this random variable.
b. Find the probability of waiting more than 20 minutes for the next ferry.
c. Find the probability of waiting exactly 20 minutes for the next ferry.
d. Find the probability of waiting between 15 and 35 minutes for the next ferry.
e. Find the conditional probability of waiting at least 10 more minutes after you have already waited 15 minutes.
f. Find the probability of waiting more than 45 minutes for the ferry on 3 consecutive independent days.

Fran would like to estimate the mean amount of time it takes people in her town to travel to work. the town's population is 150,000 and about 90,000 of those are working adults. which statements are true? select each correct answer. there is no way to infer the value of the mean. she must collect data for all 90,000 working adults and calculate the mean. a larger sample of working adults will provide a better estimate of the true mean than a smaller sample. the population of working adults is too large for using a sample to estimate the mean of the entire group. if she takes a random sample of the population of working adults in her town, the mean for that group is likely close to the mean for the entire group.

What is the value of x in the following equation. -x ^3/2 = -27

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.