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 21.5 minutes, and the...

To compute probabilities regarding the sample mean using the normal model, what size sample would be required

Extracted text: 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 21.5 minutes, and the standard deviation is 3.9 minutes. Complete parts (a) through (c). e Home ..... (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? O A. Any sample size could be used. Chapter 6 O B. The sample size needs to be greater than or equal to 30. Powerpoil OC. The normal model cannot be used if the shape of the distribution is skewed right. O D. The sample size needs to be less than or equal to 30. Chapter 7 152 powe (b) 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 0.0114 (Round to four decimal places as needed.) Chapter 8 (c) Suppose the manager agrees to pay each employee a $50 bonus if they meet a certain goal. On a typical Saturday, the oil-change facility will perform 35 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, there would be a 10% chance of the mean oil-change time being at or below what value? This will be the goal established by the manager. with AUD There is a 10% chance of being at or below a mean oil-change time of 20.7 minutes. Chapter 8 (Round to one decimal place as needed.) with AUD Chapter 9 and audio R月