CNNBC recently reported that the mean annual cost of auto insurance is 993 dollars. Assume the standard deviation is 275 dollars, and the cost is normally distributed. You take a simple random sample of 15 auto insurance policies. Round your answers to 4 decimal places. a. What is the distribution of X? X - N( b. What is the distribution of æ? ¤ - N( c. What is the probability that one randomly selected auto insurance is more than $971? d. a simple random sample of 15 auto insurance policies, find the probability that the average cost is more than $971. e. For part d), is the assumption of normal necessary? O Yeso No

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