Assess the results of Jim’s IQ test. If Jim’s third score (130) is accurate, identify the
following about Jim’s score based on a normal distribution with a mean of 100 and a standard deviation of 15:
i. Percentile rank

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.

Aboard 60 in. long is cut two parts so that the longer piece is 5 times the shorter. what are the length of the two pieces?

Hello, i need compare km^2 and km. what's difference in this?