Neco Model Questions Vol1 2025 Mathematics Question 46
Practice objective / multiple choice question 46 from the 2025 Neco Model Questions Vol1 Mathematics examination.
Class A has 30 students with a mean score of 68 and a standard deviation of 5. Class B has an unknown number of students. The mean score of class B is 75. When the two classes are combined, the overall mean is 70 and the sum of the squared deviations of class B about its own mean is 1800. Determine (i) the number of students in class B, and (ii) the combined standard deviation of all 42 students (rounded to two decimal places).
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About This Question
This is Neco Model Questions Vol1 2025 Mathematics Question 46. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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