A biology professor claims that, on the average, $15 \%$ of her students get a grade of A, $25 \%$ get a B, $35 \%$ get a C , $10 \%$ get a D, and $15 \%$ get an F. The grades of a random sample of 119 students were recorded. The following table presents the results.
$\begin{array}{c|lllll}
\text { Grade } & 1 & 2 & 3 & 4 & 5 \
\hline \text { Observed } & 28 & 11 & 38 & 13 & 29
\end{array}$

Compute the expected frequencies.
A) 17.85, 29.75, 41.65, 11.9, 17.85
B) 28, 11, 38, 13, 29
C) 0.235, 0.092, 0.319, 0.109, 0.244
D) 23.8, 23.8, 23.8, 23.8, 23.8

Question

A biology professor claims that, on the average, $15 \%$ of her students get a grade of A, $25 \%$ get a B, $35 \%$ get a C , $10 \%$ get a D, and $15 \%$ get an F. The grades of a random sample of 119 students were recorded. The following table presents the results.
$\begin{array}{c|lllll}
\text { Grade } & 1 & 2 & 3 & 4 & 5 \
\hline \text { Observed } & 28 & 11 & 38 & 13 & 29
\end{array}$

Compute the expected frequencies.
A) 17.85, 29.75, 41.65, 11.9, 17.85
B) 28, 11, 38, 13, 29
C) 0.235, 0.092, 0.319, 0.109, 0.244
D) 23.8, 23.8, 23.8, 23.8, 23.8

Quizplus · Accepted Answer

The expected frequencies are calculated by multiplying the total number of students (119) by the percentage expected for each grade: A (15%), B (25%), C (35%), D (10%), and F (15%). This gives: A = 119 * 0.15 = 17.85, B = 119 * 0.25 = 29.75, C = 119 * 0.35 = 41.65, D = 119 * 0.10 = 11.9, F = 119 * 0.15 = 17.85.

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

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