Suppose the velocities of golf swings for amateur golfers are normally distributed with a mean of 95 mph and a standard deviation of 3.9 mph. What is the difference in velocities between a golfer whose z-score is 0 and another golfer whose z-score is −1?

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?

How do you write something in scientific notation?

What is the midpoint of np if n (1,9) and p (-5-1)