A residential school stipulates the study hours as 8 : 00 pm to 10 : 3 – McqOptions

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1.	A residential school stipulates the study hours as 8 : 00 pm to 10 : 30 pm. Warden makes random checks on a certain student 11 occasions a day during the study hours over a period of 10 days and observes that he is studying on 71 occasions. Using 95% confidence interval, the estimated minimum hours of his study during that 10 day period is
A.	8.5 hours
B.	13.9 hours
C.	16.1 hours
D.	18.4 hours
Answer» D. 18.4 hours

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