Jessica jogged 4 laps around a track in 9 minutes, Luke jogged 8 laps in 27 minutes. Their rates can be expressed as the ratios 4:9 and 8:27. Are Jessica and Luke's rates equivalent? Explain.

Write 17/20 as a decimal and as a percent.

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.

What is the measure of sty in oo below? 130 310 230 50