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2. There are 15 items in a data set. The sum of the items is 300. (a) Find the mean. [2] The variance of this

2. There are 15 items in a data set. The sum of the items is 300. (a) Find the mean. [2] The variance of this data set is 9. Each value in the set is multiplied by -2. (b) (i) Write down the value of the new mean. (ii) Find the value of the new variance. (iii) Hence, write down the value of the new standard deviation. [4]

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