Four students each made a list a of prime numbers.
eric: 5, 7, 17, 23
maya: 3, 5, 13, 17
bella: 2, 3, 17, 19
jordan: 7, 11, 13, 21.
who made an error and included a composite number? write the composite number from his or her list.

Ahiking trail is 6 miles long. it has 4 exercise stations, spaced evenly along the trail. what is the distance between each exercise station?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.