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Question 3 We take a sample of size n from a Gaussian population, with Not yet answered mean u minutes and standard deviation 1.4 minutes, Marked out of representing the service time at a gas station. 5.00 Flag Find n so that we are sure with probability 0.9 that the question difference between the sample mean and the population mean u is no more than 0.4 minutes [The answer should be a number rounded to five decimal places, don't use symbols such as %] Remark: Please enter your answer as is, even though it is not an integer [ The answer should be a number rounded to five decimal places, don't use symbols such as %] If n = 20, find the error E so that we are sure with probability 0.9 that the difference between the sample mean and the population mean u is no more than E minutes [The answer should be a number rounded to five decimal places, don't use symbols such as 9%] Activate Windows Go to Settings to activate