The probability that a person will make zero, one, two, or three errors on his or her test is 0.50, 0.30, 0.15, and 0.05 respectively. If 30 test are selected, find the probability that 15 will...

The probability that a person will make zero, one, two, or three errors on his or her test is 0.50, 0.30, 0.15, and 0.05 respectively. If 30 test are selected, find the probability that 15 will contain no errors, 8 will contain one error, 5 will contain 2 errors, and 2 will contain 3 errors.