Within how many standard deviations of the mean do all of the values fall 11 14 10 8 12 13 12 18 9 12 16 15 11 9 10

Consider the function y = f(x)=3^x the values of f(1/2) and f(1/4). rounded to the nearest hundredth, are__and__ respectively

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?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?