55 Points: 0 33 of! . , l The shape ofthe distribution of the time required to get an oil change at a 20-minute oilchange facility is skewed right However, records indicate that lhe mean time ; is 21.7 minutes, and the standard deviation is 4.7 minutes. Complete parts (a) through (c). ' -m (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? O A. The sample size needs to be less than or equal to 30. Q B. The normal model cannot be used iflhe shape of the distribution is skewed right Q! C. The sample size needs to be greater than or equal to 30. D D. Any sample size could be used. lb) What is the probability that a random sample of n =35 oil changes results in a sample mean time less than 20 minutes? *The probability is approximately c.1354 . (Round to four decimal places as needed.)