Mathematics (AS & A Level) · May / June 2018 · Paper 61 · Question 1

In a statistics lesson 12 people were asked to think of a number, x, between 1 and 20 inclusive. From the results Tom found that Σx = 186 and that the standard deviation of x is 4.5. Assuming that Tom’s calculations are correct, find the values of Σx −10 and Σx −10 2. [3]

Read automatically from the paper; the printed page above is exact.