N/45=1/15
a. n= 1/3
b. n=4
c. n=675
d. n=3

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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?