Gce Model Questions Vol1 2020 Mathematics Question 5

Practice objective / multiple choice question 5 from the 2020 Gce Model Questions Vol1 Mathematics examination.

Gce Model Questions Vol1 2020 Mathematics Objective / Multiple Choice Hard Difficulty
Question 5 GCE_MODEL_QUESTIONS_VOL1 • 2020 • MATHEMATICS • objective

A class of 20 students obtained the following test scores (grouped intervals). 0-9: 2 students, 10-19: 3, 20-29: 5, 30-39: 6, 40-49: 3, 50-59: 1. Assuming each student scored the midpoint of his/her interval, calculate the mean score for the class. A second class of 20 students has a mean of 28 and a standard deviation of 8. Which class has the higher coefficient of variation? State the percentages (to one decimal place).

Answer Options

A. First class mean = 28.5, CV ≈ 40.0%; second class CV ≈ 28.6%; therefore the first class has the higher coefficient of variation.
B. First class mean = 27.5, CV ≈ 45.0%; second class CV ≈ 28.6%; therefore the first class has the higher coefficient of variation.
Correct Answer C. First class mean = 28.5, CV ≈ 46.3%; second class CV ≈ 28.6%; therefore the first class has the higher coefficient of variation.
D. First class mean = 28.5, CV ≈ 46.3%; second class CV ≈ 30.0%; therefore the second class has the higher coefficient of variation.
Correct Answer
C
Correct Option:
First class mean = 28.5, CV ≈ 46.3%; second class CV ≈ 28.6%; therefore the first class has the higher coefficient of variation.

About This Question

This is Gce Model Questions Vol1 2020 Mathematics Question 5. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Mathematics examination.

Difficulty level: Hard .

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