The mean score of all Form 5 students in a district for a mathematical aptitude exam was 75 with a standard deviation of 8.1. A random sample of 100 students in one school was taken. The mean score of these 100 students was 71.Does this indicate that the students of this school are significantly less skilled in their mathematical abilities than the average students in the district?Use a 5% level of significance and critical value approach only,formulate a decision rule and interpret theresults.