Answer:
The estimate of the mean proportion of failures for these instructors is 0.2.
Explanation:
In this question:
50 students from each instructor, so total of 50*4 = 200 students.
13 + 11 + 16 = 40 students failed.
What is the estimate of the mean proportion of failures for these instructors?
40/200 = 0.2
The estimate of the mean proportion of failures for these instructors is 0.2.