A Proofreader Checked 160 Ads for Grammatical Errors Under the Null Hypothesis of a Uniform Distribution, the Expected

Multiple Choice

A proofreader checked 160 ads for grammatical errors. The sample frequency distribution is shown: $$\begin{array} { | l | c | c | c | c | } \hline \text { Number of Errors } & 0 & 1 & 2 & 3 \\\hline \text { Observed Frequency } & 10 & 65 & 71 & 14 \\\hline\end{array}$$ Under the null hypothesis of a uniform distribution, the expected number of times we would get 0 errors is:

A) 10.
B) 20.
C) 30.
D) 40.