Gce Model Questions Vol1 2021 Mathematics Question 12

Practice objective / multiple choice question 12 from the 2021 Gce Model Questions Vol1 Mathematics examination.

Gce Model Questions Vol1 2021 Mathematics Objective / Multiple Choice Hard Difficulty
Question 12 GCE_MODEL_QUESTIONS_VOL1 • 2021 • MATHEMATICS • objective

The two classes A and B have the following statistics for a test: - Class A: 15 students, mean \(72\), standard deviation \(6\). - Class B: 20 students, mean \(68\), standard deviation \(5\). When the two classes are combined, what is the overall mean (to 1 decimal place) and the combined standard deviation (to 2 decimal places)?

Answer Options

Correct Answer A. Overall mean \approx 69.7; combined standard deviation \approx 5.80
B. Overall mean \approx 70.2; combined standard deviation \approx 5.50
C. Overall mean \approx 69.7; combined standard deviation \approx 6.00
D. Overall mean \approx 68.9; combined standard deviation \approx 6.10
Correct Answer
A
Correct Option:
Overall mean \approx 69.7; combined standard deviation \approx 5.80

About This Question

This is Gce Model Questions Vol1 2021 Mathematics Question 12. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Mathematics examination.

Difficulty level: Hard .

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