In one experiment we want to evaluate the performances of section A and section B in English examination. We randomly select a group of students from each section. The marks (out of 100) of the students are given in the table below: Section A: English Marks 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100 Frequency 1 1 2 4 4 8 15 5 Section B: English Marks 15-25 25-35 35-45 45-55 55-65 65-75 75-85 85-95 Frequency 1 1 2 5 5 6 17 3 a) Calculate coefficient of variation (CV) for both sections and compare their variability. b) Determine combined standard deviation.

In one experiment we want to evaluate the performances of section A and section B in English examination. We randomly select a group of students from each section. The marks (out of 100) of the...

In one experiment we want to evaluate the performances of section A and section B in English examination. We randomly select a group of students from each section. The marks (out of 100) of the students are given in the table below:

Section A:

English Marks	20-30	30-40	40-50	50-60	60-70	70-80	80-90	90-100
Frequency	1	1	2	4	4	8	15	5

Section B:

English Marks	15-25	25-35	35-45	45-55	55-65	65-75	75-85	85-95
Frequency	1	1	2	5	5	6	17	3

a) Calculate coefficient of variation (CV) for both sections and compare their variability.

b) Determine combined standard deviation.

Jun 07, 2022

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In one experiment we want to evaluate the performances of section A and section B in English examination. We randomly select a group of students from each section. The marks (out of 100) of the...

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