The time required to assemble an electronic component is normally distributed with a mean of 12 minutes and a standard deviation of 1.5 min. Find the probability that the average time required to assemble a sample of nine components is greater than 13 minutes. 2.28% 25.14% 97.72% 6.68% 74.86%
Added by Christina O.
Step 1
The standard deviation of the sample mean is the standard deviation of the population divided by the square root of the sample size. In this case, it is 1.5/sqrt(9) = 0.5 minutes. Show more…
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