Question

The time in minutes of each sam phone calls this week are shown on the list. Which statement is true regarding the duration of his calls?

Answer 1

Given the set of data for time in minutes below

`\lbrace9,15,5.7,9,12,11,4\rbrace`

To find the mean of the given data, the formula is

`\begin{gathered} \bar{x}=(\sum_^x)/(n) \\ n\text{ is the number of terms} \end{gathered}`

Substitute the data into the formula above

`\begin{gathered} \bar{x}=(9+15+5+7+9+12+11+4)/(8) \\ \bar{x}=(72)/(8) \\ \bar{x}=9 \end{gathered}`

The mean is 9.

Hence, the statement that is true is

The mean is greater than 8