Pvc pipe is manufactured with a mean diameter of 1.01 inch and a standard deviation of 0.003 inch. find the probability that a r
andom sample of n = 9 sections of pipe will have a sample mean diameter greater than 1.009 inch and less than 1.012 inch
2 answers:
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Answer:
B. 68%.
Step-by-step explanation:
We have been given that driving times for students' commute to school is normally distributed, with a mean time of 14 minutes and a standard deviation of 3 minutes.
First of all, we will find z-score of 11 and 17 using z-score formula.
We know that z-score tells us a data point is how many standard deviations above or below mean.
Our z-score -1 and 1 represent that 11 and 17 lie within one standard deviation of the mean.
By empirical rule 68% data lies with in one standard deviation of the mean, therefore, option B is the correct choice.