A customer service representative recorded the call durations, in minutes, for 5 phone cal… — SAT

A customer service representative recorded the call durations, in minutes, for $5$ phone calls on a Tuesday morning. The call durations are $1$ , $2$ , $3$ , $5$ , and $9$ minutes. What is the mean duration, in minutes, of these $5$ phone calls?

A
$3$
$4$ Answer
C
$5$
D
$8$

Answer

The correct answer is

4

minutes, which represents the mean duration of the phone calls.

The mean duration of the calls is found by dividing the sum of the durations by the total number of calls. The sum of the durations is

1 + 2 + 3 + 5 + 9 = 20

minutes. Dividing this sum by the

5

calls yields

20 \div 5 = 4

minutes.

Step-by-Step Solution

Calculate the sum of all the call durations.

Sum =

1 + 2 + 3 + 5 + 9 = 20

To find the mean, the sum of all values in the dataset must first be calculated.

Divide the sum by the total number of call durations.

20 \div 5 = 4

The mean is found by dividing the sum of the values by the number of values in the dataset, which is

5

Key Concept

Calculating the mean (average) of a data set by dividing the sum of all values by the count of values.

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