please help this probability and statistics questions with clear steps and explanation, thankssss

Experience indicates that a monthly longdistance telephone bills is normally dishihuted with a mean of US$17.85 and a standard deviation of US$3.39. Aer an advertising campaign aimed at increasing long-distance telephone usage, the manager of the US telephone company took a random sample of 25 household bills and recorded their monthly usage. The results are listed below. 19.61 20.14 19.57r 19.26 14.03 19.24 15.98 24.85 26 19.46 18.29 16.91 26.15 19.64 16.25 213.52 25.41' 18.19 12.56 28.4? 14.13 19.22 12.05 13.92 12.38 Do the data allow us to infer at 5% signicance level that the campaign was successful\"!I Answer Questions 1.3 below. Question 1: (1 Mark) State the null and alternative hypotheses. M: (1 Mark) Find the value of the test statistics. Question 3'. {1 Mark} Indicate the rejection region and state the conclusion