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After a repeated observation, it has been determined that the waiting time at the drive through...

After a repeated observation, it has been determined that the waiting time at the drive through window of a local bank is skewed left, with a mean of 3.5 minutes and a standard deviation of 1.9 minutes. a random sample of 100 customers is to be taken. What is the probability that the mean of the sample will exceed 4 minutes? show the numbers in the calculation. I am not getting the right equation

Math   Statistics-And-Probability   
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Answer #1

Given that, mean = 3.5 minutes and standard deviation = 1.9 minutes

sample size ( n ) = 100

Mean and standard deviation of the sampling distribution of sample mean are,

We want to find,

Therefore, the probability that the mean of the sample will exceed 4 minutes is 0.0043

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