statistics

Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal places :] f}Giving a test to a group of students, the grades and gender are summarized below --- mammals: mmmm mail-a: lfone student is chosen at random. Find the probability that the student did NOT get an "C" a. The lengths of a professor's classes has a continuous uniform distribution between 50.0 min and 52.0 min. If one such class is randomly selected, find the probability that the class length is more than 51.6 min. b. About 10% of the population has a particular genetic mutation. 600 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 600. c. A manufacturing machine has a 2% defect rate. If 8 items are chosen at random, what is the probability that at least one will have a defect? d. A group of people were asked if they had run a red light in the last year. 284 responded "yes", and 379 responded "no". Find the probability that if a person is chosen at random, they have run a red light in the last year. e. About 10% of the population has a particular genetic mutation. 600 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 600. f. A manufacturing machine has a 2% defect rate. If 8 items are chosen at random, what is the probability that at least one will have a defect? g. A binomial experiment consists of 18 trials. The probability of success on trial 11 is 0.29. What is the probability of failure on trial 15