The following frequency distribution represents the number of hours studied per week by a sample of 50 students. The mean number of hours studied is:
A)7 hours
B)8 hours
C)22.8 hours
D)480 hours

Question

The following frequency distribution represents the number of hours studied per week by a sample of 50 students.  The mean number of hours studied is:
A)7 hours 
B)8 hours 
C)22.8 hours 
D)480 hours

Quizplus · Accepted Answer

To find the mean, we need to multiply each value by its frequency, sum up the products, and then divide by the total frequency. Using the given frequency distribution:

(0*1) + (2*2) + (4*7) + (6*16) + (8*14) + (10*6) + (12*2) + (14*2) + (16*1) = 320
320/50 = 6.4

Therefore, the mean number of hours studied is 6.4, which rounds up to 8 hours (B).

The Following Frequency Distribution Represents the Number of Hours Studied