Neco Model Questions Vol1 2020 Mathematics Question 16
Practice objective / multiple choice question 16 from the 2020 Neco Model Questions Vol1 Mathematics examination.
Two classes of students sat for the same mathematics test. Class A has 30 students with a mean score of \(68\) and a variance of \(25\). Class B has 20 students with a mean score of \(73\) and a variance of \(16\). Assuming the combined mean of all 50 students is \(70\), calculate the combined standard deviation of the whole group. Give your answer correct to two decimal places.
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About This Question
This is Neco Model Questions Vol1 2020 Mathematics Question 16. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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