Gce Model Questions Vol1 2020 Mathematics Question 47
Practice objective / multiple choice question 47 from the 2020 Gce Model Questions Vol1 Mathematics examination.
Class A has 20 students with a mean score of \(68\) and a standard deviation of \(5\). Class B has 30 students with a mean score of \(74\) and a standard deviation of \(8\). When the two classes are combined, the overall mean is \(71.5\). Assuming the two classes are independent, calculate the combined standard deviation of all 50 students (give your answer to two decimal places).
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About This Question
This is Gce Model Questions Vol1 2020 Mathematics Question 47. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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