per the barron's report the average weeks unemployed is 21.5 (population mean) with a population standard deviation of 5 weeks and a sample of 55. in the next five questions we will be calculating the probability that the sample of 55 will provide a mean within 1 week of the population mean. what is the probability to 4 decimals for (x<22.5)? use the rounded standard error of the mean in calculations.