Mean, standard deviation? Watch

M12S
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The gcse score is g and A level score is a and for maths in 1999 the coding equation was given by a =2.6g -9.42
This year there are 66 second year students and their gcse scores are summarised as Sum of g =408.6 and Sum of (g-mean of g)^2 =15.45
A) find mean and standard deviation of the gcse scores
B) find mean andstandard deviation of predicted A Levels grades

Please help
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