The mean lifetime of a tire is 42 months with a standard deviation of 5 months. If 117 tires are sampled, what is the probability that the mean of the sample would differ from the population mean by less than 0.72 months? Round your answer to four decimal places.

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.