The ages, in years, of a group of students are given in the box. Work out the mode.11 11 12 13 13 14 15 15 15 15

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

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?