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Part One: Recap of the Easy Stuff

Learning Objectives

- To review what we know/can remember about mean, median, mode and range

The Mean

To find the meanof a set of data you need to:

1. Find the total of all the data

2. Divide the total by the number of data values

e.g. Find the mean of these numbers:

1) 55, 23, 54, 12, 87, 32

2) 1.3, -0.34, -2.6, 0.57, 85

The Mode

The modeof a set of data is the most common or most popular value

The mode does nothave to be a number

e.g. Find the mode of these two sets of data:

1) 95, 90, 91, 90, 89, 84, 90

2) a, b, c, b, c, b, a, b, a, c, c

The Median

- The medianis the piece of data in the middle
- To find it you must first put all the data in size order
- If you have two middle values, add them together and divide by two to get the answer
e.g. Find the median of these two sets of data:

1) 29, 25, 0, 32, 14, 22, 14

2) 3.2, -27, 8.65, 0.04, 22.3, -1.1

The Range

The rangeof a set of data is the biggest value take away the smallest

e.g. Find the range of these numbers:

1) 321, 554, 201, 438, 212, 545

2) 0.97, -2.213, -2.5, -1.1, 0.499