A-LevelMathematicsProbability and statisticsOct/Nov 2018Paper 6 Q56 Marks
The Quivers Archery club has 12 Junior members and 20 Senior members. For the Junior members, the mean age is 15.5 years and the standard deviation of the ages is 1.2 years. The ages of the Senior members are summarised by ∑y = 910 and ∑y² = 42 850, where y is the age of a Senior member in years.
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