The average (mean) number of hours spent on the computer is equal to 4.7 hours.
What is an arithmetic average?
An arithmetic average is also referred to as mean and it can be defined as a ratio of the sum of the total number in a data set to the frequency of the data set.
How to calculate the mean?
Mathematically, the arithmetic average for a given data set can be calculated by using this formula:
Average = [F(x)]/n
Next, we would calculate the arithmetic average for the number of hours spent on the computer as follows:
F(x) = 1(3) + 2(6) + 3(11) + 4(25) + 5(18) + 6(16) + 7(7) + 8(4) + 9(1)
F(x) = 3 + 12 + 33 + 100 + 90 + 96 + 49 + 32 + 9
F(x) = 424.
For the total number of students, we have:
n = 3 + 6 + 11 + 25 + 18 + 16 + 7 + 4 + 1
n = 91
Substituting the parameters into the formula, we have;
Average = 424/91
Average = 4.7 hours.
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