Computation:You are measuring the bulk air temperature in a closed- loop benchtop wind tunnel. You take FIVE readings of the temperature and determine that the average temperature is 77 degrees Celsius with a standard evocation of 4 degrees Celsius l. You report the following information:T = 77 degrees +- 1.8 degrees Celsius (68% confidence Level)Answers provided. I just need explanation. I will rate accordingly. Thank you!

Q.07 (9) Last, you decide that you want to reduce the error of your measurements so that your mean temperature deviates only by +1.5 C, keeping a standard deviation of 4 C with a 95% confidence level. (a) How many measurements will you need to take (M) to achieve this? (6) (b) Is this a feasible/reasonable task? Explain. (3) Answers: (a) N~28