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Measures of Location and Spread

Distinguish between a measure of location and a measure of spread.

A

Using summary statistics, the formula for standard deviation is sd=∑x2n−xˉ2\text{sd} = \sqrt{\frac{\sum x^2}{n} - \boxed{\bar{x}^2}}sd=n∑x2​−xˉ2​​.

B
  • LLL: lower boundary of the median class.
  • fff: frequency of the median class.
C

Rearrange the formula to undo the coding: tˉ=2xˉ+20\bar{t} = 2\bar{x} + 20tˉ=2xˉ+20.

D
  • Location: describes where the data is centred (e.g. mean).
  • Spread: describes how varied or consistent the data is (e.g. standard deviation).

Measures of Location and Spread Flashcards

  1. A Level
  2. /Maths
  3. /Measures of Location and Spread

Flashcards for Edexcel A Level Maths Measures of Location and Spread, covering the key formulae, methods and definitions you need to recall for Paper 1, Paper 2 and Paper 3. 20 cards drawn from 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, matched to the Edexcel A Level Maths (9MA0) specification. Recall questions account for roughly 50% of marks at A Level Maths, so these target the marks you can secure before the paper starts.

Flashcards