Marshall and Lily checked 160 ads for grammatical errors. The sample frequency distribution is shown below. Number of Er

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Marshall and Lily checked 160 ads for grammatical errors.
The sample frequency distribution is shown below.
Number of Errors 0 1 2 3
Observed Frequency 10 65 71 14
Under the null hypothesis of a uniform distribution (that is,
the probability of getting each number of errors is 25%), the
expected number of times we would get 2 errors is
a.) 40
b.)50
c.)10
d.) 30
e.) 20