in detail asap please

QUESTION 3 The mean amount of time to build a store is 60 days. A claim is made that the mean amount of time has decreased due to the large numbers of people involved in constructing the store. To support the claim, a sample of 32 stores was selected at random, and the mean amount of time to build a store was 55 days with a standard deviation of 10. Perform the required hypothesis testing at 5% significance level to support the claim