At the beach cleanup, maya's group collected 14.8 pounds of trash on saturday and 12.5 pounds on sunday. will's group collected the same total amount of trash as maya's group but collected only 11.8 pounds on saturday.

how much trash did will's group collect on sunday?

a.
3.0 pounds

b.
12.5 pounds

c.
15.5 pounds

d.
27.3 pounds

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.