Beth asked every teacher at her school how long it took them to travel to work. Beth's results are summarised in the summary statistics below.
n=100∑x=4250∑x2=217 874 n = 100 \quad \sum x = 4250 \quad \sum x^2 = 217\,874 n=100∑x=4250∑x2=217874Calculate the mean and the standard deviation for these data.
96 exam-style questions on Edexcel A 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.