hi tutor, i need help with the following questions

Q1.A toy designer wants to determine the average time taken for an adult to assemble a toy. 24 people were randomly chosen to assemble the toy and the time taken (in minutes) were as follows: 17, 13, 18, 19, 17, 21, 29, 22, 16, 28, 21, 15 26, 23, 24, 20, 8, 17, 17, 21, 32, 18, 25, 22 a) Use unbiased point estimate to infer the average time for an adult to assemble the toy. b) Use interval estimate to infer the average time for an adult to assemble the toy with 99% confidence level. c) Use hypothesis testing to infer whether the average time for an adult to assemble the toy is at least 18 mins with a 5% significance level