Please help me solve using Microsoft excel//A recent survey of 50 executives who were laid off from their previous position revealed it took a mean

Please help me solve using Microsoft excel//A recent survey of 50 executives who were laid off from their previous position revealed it took a mean of 26 weeks for them to find another position. The standard deviation of the sample was 6.2 weeks. Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks?