Iwill award a 12-person road crew is scheduled to finish repairing a highway in 6 days. on the morning of the third day , several new workers join the crew and, together, they complete the remaining repairs in 2 days. how many new workers joined the crew?

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?