QUESTION 4 Courier Express wished to determine the average weight of parcels carried by its Brisbane operations. On the basis of historical data, the company was aware that the weight of

parcels could be approximated by a normal distribution with a variance of 0.437 kilograms squared. Last month, it weighed a random sample of 22 parcels and found the average weight was 2.236 kg. Determine a 95% confidence interval for the average weight of parcels carried by Courier Express. State the upper limit of the interval only, giving your answer to two decimal places.