Solve these equations 1 6.5=-3+n 2 x/4=12/6 (20 points)

Find the power series expantion of f(z)=log(4=3z) at the point z=-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?

Which one ? is the answer and how to find this answer