Calculate the mean, median and mode of ungrouped data

Follow this one with me, a step at a time. Try to guess each step first.

Worked example 1

Find the mean of the following data: 3, 16, 3, 14, 10, 18, 3, 15, 17

Remember: Add up all the data, then divide by how many data there are.

The sum of the data is 3 + 16 + 3 + 14 + 10 + 18 + 3 + 15 + 17 = 99.
There are 9 data, so the mean is 99 ÷ 9 = 11.
The mean is 11.

Common mistakes

Gave the mode, the value that occurs most often.
Gave the median, the middle value when the data are in order.
Sorted the data and stopped one place from the middle.