Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information.
-Refer to Exhibit 5-7. The expected number of cups of coffee is
A)1
B)1.2
C)1.5
D)1.7

Question

Exhibit 5-7
A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information. 
-Refer to Exhibit 5-7. The expected number of cups of coffee is
A)1 
B)1.2 
C)1.5 
D)1.7

Quizplus · Accepted Answer

The expected number of cups of coffee is calculated by taking the sum of (number of cups)*(frequency of that number of cups) for each possible number of cups, and dividing by the total number of respondents. In this case, the calculation is: (0*370 + 1*1080 + 2*745 + 3*280 + 4*25)/2500 = 1.2. Therefore, the best choice is B.

Exhibit 5-7 A Sample of 2,500 People Was Asked How Many Cups