The CEO of a company wants to know the number of cups of coffee his employees drink in a week. The number of cups of coffee drunk by a sample of employees is shown below.
10, 13, 9, 7, 7, 9, 10, 10, 13, 9, 7, 10
Assuming the sample is representative of all the employees in the company, what is the mean number of cups of coffee an employee of the company drinks per week?
A.
12.5
B.
11.5
C.
9.5
D.
10
Did you not simply add up the data values and divide that by 12 ?
To find the mean number of cups of coffee an employee drinks per week, add up all the values and divide by the number of values.
Add up all the values:
10 + 13 + 9 + 7 + 7 + 9 + 10 + 10 + 13 + 9 + 7 + 10 = 114
Divide by the number of values:
114 รท 12 = 9.5
Therefore, the mean number of cups of coffee an employee of the company drinks per week is 9.5 (option C).
To find the mean number of cups of coffee an employee of the company drinks per week, you need to calculate the average of the given sample data.
To calculate the mean, you add up all the values in the sample data and divide the sum by the number of values.
Given sample: 10, 13, 9, 7, 7, 9, 10, 10, 13, 9, 7, 10
Step 1: Add up all the values:
10 + 13 + 9 + 7 + 7 + 9 + 10 + 10 + 13 + 9 + 7 + 10 = 114
Step 2: Divide the sum by the number of values:
114 / 12 = 9.5
Therefore, the mean number of cups of coffee an employee of the company drinks per week is 9.5.
Hence, the answer is C. 9.5.