statistics

The average repair cost of a microwave oven is 555, with a standard deviation of 85. The costs are normally distributed. If 12 ovens are repaired, find the probability that the mean of the repair bills will be greater than 605. None of these O 0.0062 O 0.015 O 0.1056 O * Question What value is the sum of the probabilities in a probability binomial distribution? Nearly 1.0 O It depends on the variable O 1.0 0 It varies with the number of values in the distribution O