Averages

This set of cards covers averages; mode, median, mean and range. It's pretty easy once you get your head around it.

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Mode

The mode is easy and I remember it using MOst (The MO meaning Most Often). In your exam, you will probably be given a set of numbers -

1,12,25,7,11,19,4,6,9,23,9,15,9,22,9

Before you can attempt averages, you need to put these numbers in numerical order - 1,4,6,7,9,9,9,9,11,12,15,19,22,23,25

Just find the number that is repeated in the sequence most often (in this case 9) and your sorted. Easy.

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Median

Median is just the middle number of a sequence. I'll use the same set of numbers (minus the numerical order bit):

1,4,6,7,9,9,9,9,11,12,15,19,22,23,25.

The median is basically what it says on the tin - the middle number and the easiest way of doing that is to cross the numbers out one by one;

1 then 15 then 4 then 23 and so on until you get something like this : 1,4,6,7,9,9,9,9,11,12,15,19,22,23,25. The median is 9.

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Mean

The mean is so easy, a five year old could do it (providing they can add and divide). Again, I'll use the same set of numbers: 1,4,6,7,9,9,9,9,11,12,15,19,22,23,25.

All you do is add em' up 1+4+6+7+9+9+9+9+11+12+15+19+22+23+25=181 (you may need a calculator) and divide by how many numbers there are (15)

181/15=12.066667

The numbers on your exam will add up to make a whole number/ integer.

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Range

Same set of numbers again -

Smallest > 1,4,6,7,9,9,9,9,11,12,15,19,22,23,25 < Biggest

The range is probably the easiest of all the averages. You just take the smallest number away from the biggest: 25 - 1 = 24 < thats the range.

I hope my average revision cards helped, they're my first set so let me off with a few mistakes! Thanks.

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Comments

Nathan

very useful

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