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1. Make sure you arrange the data in order before picking out the median.
2. Make sure that you can calculate the mean correctly from…

Page 2

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Wrong: x = 10y + 2.5 = 10×3.82 + 2.5 = 40.7

Right: x = 10y = 10×3.82 = 38.2

8. Do not confuse variance and standard deviation when using coding methods. If data is multiplied by k, the
standard deviation is multiplied by k, but the variance is multiplied…

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10. Understand what is meant by mutually exclusive events. Mutually exclusive events cannot both occur at the
same time. For example, "getting a 3" and "getting a 6" when you throw a die are mutually exclusive, whereas
"getting an even number" and "getting a multiple of 3" are not. Remember…

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3. Define your variables. Carefully define your non-standardised variable with X or Y or..... (but of course not Z).
4. Be careful to distinguish between values of Z and values of X. Confusion with notation makes it harder for you to
be awarded method marks. Show clearly how you are…

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