Apiece of string is cut in half, so thata one half can be used to bundle newspapers for recycling. one thrid of the remaining string is cut off and used to tie a parcel. the leftover string is 2m. how long was the whole piece of string?

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

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.

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?