The number of phone calls arriving at a switchboard each hour has been recorded,and the following frequency distribution has been developed. What is the relative frequency of the second class?
A) 0.455
B) 0.900
C) 0.225
D) 0.750
E) 0.725

Question

The number of phone calls arriving at a switchboard each hour has been recorded,and the following frequency distribution has been developed.  What is the relative frequency of the second class?
A) 0.455 
B) 0.900 
C) 0.225 
D) 0.750 
E) 0.725

Quizplus · Accepted Answer

To find the relative frequency of the second class, we need to divide the frequency of the second class by the total frequency. The frequency of the second class is 9 and the total frequency is 40. So, the relative frequency of the second class is 9/40, which is equal to 0.225. Therefore, the best choice is C.

The Number of Phone Calls Arriving at a Switchboard Each