Question 9 The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is

[answerhappygod]

Question 9 The Shape Of The Distribution Of The Time Required To Get An Oil Change At A 10 Minute Oil Change Facility Is 1 (133.51 KiB) Viewed 19 times

Question 9 The shape of the distribution of the time required to get an oil change at a 10-minute oil-change facility is unknown. However, records indicate that the mean time is 10.8 minutes, and the standard deviation is 3.6 minutes. (a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required? O The normal model cannot be used if the shape of the distribution is unknown. The sample size needs to be less than 30. The sample size needs to be greater than 30. O Any sample size could be used. - (b) The probability that a random sample of n than 10 minutes is approximately 40 oil changes results in a sample mean time less Round to 4 decimal places. (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 40 oil changes between 10 A.M. and 12 P.M. Treating this as a random sample, at what mean oil change time would there be a 11% chance of being at or below? This will be the goal established by the manager. minutes. Round to the There would be a 11% chance of being at or below nearest 1 decimal place