Question:The shape of the distribution of the time required to get an
oil change at a...
Question
The shape of the distribution of the time required to get an
oil change at a...
The shape of the distribution of the time required to get an
oil change at a 20-minute oil-change facility is unknown.
However, records indicate that the mean time is 21.7 minutes, and
the standard deviation is 4.6 minutes.
(a) To compute probabilities regarding the sample mean using
the normal model, what size sample would be required?
(b) What is the probability that a random sample of nequals35
oil changes results in a sample mean time less than 20
minutes?