Raju is the star player of his school’s basketball team. He claims that on average he would score [latex]21[/latex] points per game. Raju’s career score is normally distributed with a standard deviation of [latex]7[/latex] points. A sample of [latex]15[/latex] sets of Raju’s games are collated and it is found that the mean sample score is [latex]18.3[/latex] points.
At [latex]10[/latex]% level of significance, test whether Raju has overstated his claim.