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
1515-minute
oil-change facility is unknown. However, records indicate that the mean time is
16.8 minutes16.8 minutes,
and the standard deviation is
4.8 minutes4.8 minutes.
Complete parts (a) through
(c).
(a) To compute probabilities regarding the sample mean using the normal model, what size sample would be required?
Homework Answers
a)
since here distribution of oil chance is unknown, therefore from central limit theorem, sample size should be at least 30 for normal approximation.
therefore sample size needs to be greater than 30.
b)
Please reply for other parts as only part a) is given in above,
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The shape of the distribution of the time required to get an oil
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