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Part One: Recap of the Easy Stuff

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

I’m not really sure

What the MEAN is about

Just add them all up

And share them all out

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

I don’t want to brag

I don’t want to boast

I am the MODE

I am the most

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

I don’t know the rhyme

I don’t know the riddle

I am the MEDIAN

And I’m in the middle!

- 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

From largest to smallest

See how they change

Take them away

And I am 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