Ples hurry i need to do the maths 67 points last day of schol 2 + 2 x 4 (5)^2/467

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

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

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.