Marlis has 765 songs on her ipod she deletes 153 of the songs what is the percent of decreasse in the number of songs on her ipod

What is the exact volume of the cylinder 1.5 m 2.5 m

Use the quadratic formula to solve 5x=6x^2-3,what are the values of x?

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.