Can I get help with B?

The shape of the distribution of the time required to get an'oillchange at a 20-minute oil-change facility is skewed right. However, records indicate that the mean time is 21.1 minutes. and the standard deviation ls 4.2 minutes. Complete parts (a) through (c). Mww (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? l d A. The sample size needs to be greater than or equal to 30. O B. Any sample size could be used. .! O c. The normal model cannot be used if the shape of the distribution is skewed right. ' ' @'D. The sample size needs to be less than or equal to 30. (b) What is the probability that a random sample of n =40 oil changes results in a sample mean time less than 20 minutes? The probability is approximatein (Round to tour decimal places as needed.)