Adentist selected 16 patients at random from a population of more than 1000 patients and asked them how many times the patient flosses per week. the dentist made a line plot of the results.

what is the estimated mode of the number of times all patients floss per week?

a. 5
b. 5.5
c. 6
d. 7

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.