The manager of a grocery store took a random sample of 100 customers. the avg. length of time it took the customers in the sample to check out was 3.1 minutes with a std. deviation of 0.5 minutes. we want to test to determine whether or not the mean waiting time of all customers is significantly > 3 min. at 95% confidence, it can be concluded that the mean of the population isa. significantly greater then 3.18b. not significantly greater than 3c. significantly less than 3d. significantly greater than 3

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −