Rectangle CDEF is rotated 45° in a clockwise direction. To which angle of the image does angle D correspond?

How do i do this? i don’t understand

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

What are different types of statistical programs