Can someone help on this?

Allegiant Airlines charges a mean base fare of $89. 'In addition, the airline charges for making a reservation on its website, checking bags, and lnight beverages. These additional charges average $35 per passenger. Suppose a random sample of 50 passengers is taken to determine the total cost of their ight on Allegiant Airlines, The population standard deviation of total flight cost is known to be $39. Use z-table. a. What is the population mean cost oeright? I) What is the probability the sample mean will be within $10 ofrhe population mean cost peright (to 4 decimals}? :a o c. What is the probability the sample mean will be within $5 of the population mean cost per flight (to 4 decimals)? \\ a 0