Waec Model Questions Vol1 2020 Mathematics Question 44

Practice objective / multiple choice question 44 from the 2020 Waec Model Questions Vol1 Mathematics examination.

Waec Model Questions Vol1 2020 Mathematics Objective / Multiple Choice Hard Difficulty
Question 44 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • MATHEMATICS • objective

Class A has 30 students with a mean score of 68 and a standard deviation of 5. Class B has 20 students with a mean score of 74 and a standard deviation of 4. When the two classes are combined, what is the overall mean score and the combined standard deviation (rounded to two decimal places)?

Answer Options

Correct Answer A. \(Mean = 70.4\), Standard \(deviation = 5.46\)
B. \(Mean = 70.0\), Standard \(deviation = 5.20\)
C. \(Mean = 69.6\), Standard \(deviation = 5.10\)
D. \(Mean = 71.2\), Standard \(deviation = 5.80\)
Correct Answer
A
Correct Option:
\(Mean = 70.4\), Standard \(deviation = 5.46\)

About This Question

This is Waec Model Questions Vol1 2020 Mathematics Question 44. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Mathematics examination.

Difficulty level: Hard .

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