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If there is no single number that occurs more than once, either every number in the set is the mode or there is no mode - check with your teacher to see which answer he/she wants you to use.
It can be really different on how you work it out and how your maths is but I think it is 3-4 %
Same as average. For example, if you have 5 numbers, add them all up, then divide the result by 5. If you have 10 numbers, you add and divide by 10, etc.
You can get free maths lessons online at www.extra maths work.co.uk
to work out various different types of averages