Sofia measured the heights, in centimetres above a reference level, of every plant in a greenhouse. Sofia's results are summarised in the summary statistics below.
n=72∑x=2700∑x2=112 500 n = 72 \quad \sum x = 2700 \quad \sum x^2 = 112\,500 n=72∑x=2700∑x2=112500Calculate the mean and the 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.