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What is your solution? How did you solve it?
Edwin wanted to improve his typing so he practised and tested himself regularly. His mean typing speed after nine tests was 38·5 words per minute. What speed would he need in the next test to increase his average to 40 words per minute?

Mean

The mean is the average of a group of numbers altogether.

For eg.

1,4,6,3,7,9,

Add them together, so

= 30

Then divide it by the amout of numbers, in this case it is 6, so:

30/6 = 5

The average number is 5.

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