CAIE S1 2010 June — Question 2

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2010
SessionJune
TopicMeasures of Location and Spread
TypeCalculate mean from coded sums
2 The heights, \(x \mathrm {~cm}\), of a group of 82 children are summarised as follows. $$\Sigma ( x - 130 ) = - 287 , \quad \text { standard deviation of } x = 6.9 .$$
  1. Find the mean height.
  2. Find \(\Sigma ( x - 130 ) ^ { 2 }\).
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