6.1. The Mean http://www.ck12.org
Step Two:
Step Three:
Step Four:
Press 2nd0 to obtain the CATALOGUE function of the calculator. Scroll down to sum( and enterL 3 →
You can repeat this step to determine the sum ofL 2 →
x ̄=300
12
= 25
A frequency table can also be drawn to include a tally column. To calculate the mean of a set of data, the values do
not have to be arranged in ascending (or descending order). Therefore, the tally column acts as a speedy method of
determining the frequency of each value.
Example 3:A survey of 30 students with cell phones was conducted by teachers to determine the mean number of
hours a student spends each week on their cell phone.
Following are the estimated times:
12, 15, 20, 8, 25, 11, 8, 11, 15, 14, 14, 20, 18, 13, 8, 28, 12, 12, 13, 20, 5, 8, 13, 11, 5, 18, 24, 16, 14, 18