A Biology Professor Claims That, on the Average $15 \%$ Of Her Students Get a Grade Of

Multiple Choice

A biology professor claims that, on the average, $15 \%$ of her students get a grade of $\mathrm { A }$ , $30 \%$ get a $\mathrm { B } , 30 \%$ get a $\mathrm { C } , 10 \%$ get a D, and $15 \%$ get an $\mathrm { F }$ . The grades of a random sample of 105 students were recorded. The following table presents the results.
$\begin{array}{c|lllll}\text { Grade } & 1 & 2 & 3 & 4 & 5 \\\hline \text { Observed } & 17 & 39 & 26 & 5 & 18\end{array}$

Test the hypothesis that the grades follow the distribution claimed by the professor. Use tl $\alpha = 0.01$ level of significance.

A) Do not reject $H _ { 0 }$ .
B) Reject $H _ { 0 }$ .