Igcse Model Questions Vol1 2017 Mathematics Question 9
Practice objective / multiple choice question 9 from the 2017 Igcse Model Questions Vol1 Mathematics examination.
A class of 30 students took two examinations, A and B. The mean score for exam A is 68 and for exam B is 72. The overall mean of all 60 scores is 70. The sum of squared deviations from the mean for exam A is 540 and for exam B is 720. Find the combined standard deviation of all 60 scores, giving your answer to two decimal places.
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About This Question
This is Igcse Model Questions Vol1 2017 Mathematics Question 9. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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