A bag contains n counters. one of the counters is blue and the rest is red. two counters are taken at random. a) express in terms of n the probability that a counter of each counter is chosen.

b) the probability that a counter of each colour is 0.125. work out the number of red counters

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?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?