Please help with this one, can't seem to figure it out. Thank you!

A random sample of 47 observations with a mean of 81 is selected from a normally distributed population. Assume the population standard deviation is 19. In developing a(n) 92% confidence interval estimate for the population mean, determine the following values: `[Do not round] Point Estimate = [2 decimal places] Significance level (a) = Round the critical value to two (2) decimal places and use the rounded value to calculate parts d) to g). [Enter a positive value] Critical value = [3 decimal places] Standard Error of the Mean = [1 decimal place] Margin of Error = [1 decimal place] Lower Confidence Limit = [1 decimal place] Upper Confidence Limit = How large a sample is required to keep the margin of error within 4 units with 92% confidence? Report your answer as an integer