Question

"Question 6 The following table gives the distribution of students of two sections according to the mark obtained by them:

Section A Section B
Marks Frequency Marks Frequency
0 − 10 3 0 − 10 5
10 − 20 9 10 − 20 19
20 − 30 17 20 − 30 15
30 − 40 12 30 − 40 10
40 − 50 9 40 − 50 1

Represent the marks of the students of both the sections on the same graph by two frequency polygons. From the two polygons compare the performance of the two sections.

Class 9 - Math - Statistics Page 260"

Answer 1

A frequency polygon is the polygon obtained by joining the midpoints of upper horizontal sides of all the rectangles in the histogram. Frequency polygons can also be drawn independently without drawing histogram.

 For this we first find class mark of a class interval by using the formula

Class mark=( upper limit + lower limit) /2

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Solution:

We make modified table by given data as shown in the attachment.

 

Now the required frequency polygons are in the attachment.

 

It is clear that from the polygon that the performance of section A is better in comparison or section B.

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Hope this will help you....

Answer 2

Answer:

good it can't be solve by me some trouble