Neco 2021 Mathematics Question 17

Practice objective / multiple choice question 17 from the 2021 Neco Mathematics examination.

Neco 2021 Mathematics Objective / Multiple Choice Hard Difficulty
Question 17 NECO • 2021 • MATHEMATICS • objective

Group A consists of 12 students whose exam scores have a mean of 75 and a variance of 16. Group B consists of 18 students with a mean of 68 and a variance of 25. Find the overall mean and the overall standard deviation of the combined 30 students. Give your answer for the standard deviation correct to two decimal places.

Answer Options

Correct Answer A. Mean = 70.8, SD = 5.74
B. Mean = 70.8, SD = 4.63
C. Mean = 70.8, SD = 5.64
D. Mean = 71.5, SD = 5.74
Correct Answer
A
Correct Option:
Mean = 70.8, SD = 5.74

About This Question

This is Neco 2021 Mathematics Question 17. It is one of the objective questions from the 2021 Neco Mathematics examination.

Difficulty level: Hard .

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