A sports centre asked all 45 members of its junior athletics squad how many minutes they spent training last Saturday. The results are summarised below, where n n\,n is the number of athletes, ∑x \sum x\,∑x is the total training time, and Sxx=∑(x−xˉ)2S_{xx}=\sum (x-\bar{x})^2Sxx=∑(x−xˉ)2.
Calculate the mean and the population standard deviation for these data.
32 exam-style questions on Edexcel AS Level Maths Measures of Location and Spread, covering 2.1 Measures of Central Tendency, 2.2 Other Measures of Location, 2.3 Measures of Spread, 2.4 Variance and Standard Deviation, and 2.5 Coding. Each one has a worked solution and a mark scheme showing where the marks go.