An undergraduate business student studies diligently in the library late in the term in anticipation of an outstanding performance on her final exams
She asks a friend to spy on her at random intervals to determine what percentage of time she is actually studying. Over the course of three days, her friend records the following observations:
Observation Period Times
Studying Times Not
Studying Observations
Monday 19 4 23
Tuesday 22 4 26
Wednesday 9 2 11
Based on this work sample, what percentage of time was the student actually studying?
Total observations = 60
Number of observations student was studying = 50
% of time studying = 50 / 60 = 83.3%
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