Answer Happy

The shape of the distribution of the time required to get an all change at a 10-minute oll-change facility is unknowns. However, records indicate that the mean time is 116 minutes, and the standard deviation is 41 min Complete parts (a) through (c) (4) To compute probabilities regarding the sample mean using the nomal model, what size sample would be required? A The sample sire needs to be greater than or equal to 30 OB. The normal model cannot be used if the shape of the distribution is unknown OC. The sample size needs to be less than or equal to 30 OD. Any sample size could be used (b) What is the probability that a random sample of 35 oll changes results in a sample mean time less than 10 minutes? The probability is approximately (Round to four decimal places es needed) (c) Suppose the manager agrees to pay each employee a 550 bonus & they meet a certain goal sample, there would be a 10% chance of the mean oll-change fine being at or below w suom There is a 10% chance of being at or below a mean oil change time (Round to one decimal place as needed) a typical Saturday, the all-change facility will performs 35 ell changes between 10 AM and 12 PM Treating this as a random valus? This will be the goal established by the manager