what is the answer

Scores on a statistics final in a large class were normally distributed with a mean of 75 and a standard deviation of 6. Find the following probabilities, round to the fourth. a) What is the probability 12 randomly chosen scores had an average greater than 75 Would it be unusual or usual for this to happen? usual b) What is the probability 8 randomly chosen scores had an average less than 67 Would it be unusual or usual for this to happen? usual X Submit