A sociologist studying freshmen carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. The table below provides the answers on the time slept and the time spent studying. What proportion of freshman slept at least 6 hours?
A)1
B)0.46
C)0.71
D)0.25

Question

A sociologist studying freshmen carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. The table below provides the answers on the time slept and the time spent studying.  What proportion of freshman slept at least 6 hours?
A)1 
B)0.46 
C)0.71 
D)0.25

Quizplus · Accepted Answer

From the table, we can see that there are a total of 174 students. To find the proportion of students who slept at least 6 hours, we need to add up the number of students who slept 6, 7, 8, or 9 hours:

62 + 54 + 40 + 15 = 171

Therefore, the proportion of freshman who slept at least 6 hours is:

171/174 ≈ 0.71

So the answer is (C).

A Sociologist Studying Freshmen Carried Out a Survey, Asking (Among