Easy points, what’s 9+10?

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

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 is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)