content area top Part 1 The shape of the distribution of the time required to get an oil change at a 20-minute oil-change facility is skewed right. However, records indicate that the mean time is 21.6 minutes, and the standard deviation is 4.3 minutes. Complete parts (a) through (c). (b) What is the probability that a random sample of nequals35 oil changes results in a sample mean time less than 20 minutes