CK-12-Basic Probability and Statistics Concepts - A Full Course

5.2. Ungrouped Data to Find the Mean http://www.ck12.org

Step 4:

Press

2ND

0

to obtain the CATALOG menu of the calculator. Scroll down to the sum function and enterL 3 →

.

You can repeat this step to determine the sum ofL 2 →

.

Now the mean of the data can be calculated as follows:

x=

324

12

= 27

Note that not all the data values and frequencies are visible in the screenshots, but rest assured that they were all
entered into the calculator.

After entering the data into L1, the frequencies into L2, and pressing

2ND

MODE

, another way to solve this problem with the calculator would have been to press

2ND

STAT

, go to the MATH menu, choose option 3, and enter L1 and L2 separated by a comma so that you have mean(L1,
L2). Then press

ENTER

to get the answer. This way, the calculator will do all the calculations for you.