In a class of 30 students, the mean mass of the 14 boys is 63.5kg and the
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In a class of 30 students, the mean mass of the 14 boys is 63.5kg and the mean mass of the girls is 57.3kg. Calculate the mean and standard deviation of the masses of all the students together, given that the sums of the squares of the masses of the boys and girls are 58444kg2 and56222kg2, respectively.
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Mean mass 604 kg Standard deviation 89 kg Explanation The total number of ...View the full answer
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Related Book For 
Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook
ISBN: 9781108407304
1st Edition
Authors: Dean Chalmers, Julian Gilbey
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