SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier.
-Referring to Scenario 2-5, if 100 calls were randomly sampled, how many calls lasted 15 minutes or longer?
A)10
B)14
C)26
D)74

Question

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Scenario 2-5, if 100 calls were randomly sampled, how many calls lasted 15 minutes or longer?
A)10 
B)14 
C)26 
D)74

Quizplus · Accepted Answer

According to the data in Scenario 2-5, the percentage of calls that lasted 15 minutes or longer is 30%. Therefore, if 100 calls were randomly sampled, we can expect approximately 30% of them to last 15 minutes or longer.

30% of 100 = 0.3 x 100 = 30

Therefore, we can expect around 30 calls to last 15 minutes or longer. The closest option to that is C (26), so our answer is C.

SCENARIO 2-5 the Following Are the Duration in Minutes of a Sample