Statistics - Cumulative plots

Statistics – Cumulative plots

A cumulative plot is a method to attract cumulative data graphically. It shows the quantity / percentages, or proportion of observations which are lower than or equal to specific worth.

Instance

Drawback Assertion:

Draw the frequency and comulative frequency plots of 10 pupil check scores based mostly on following knowledge.

Sr. No. Roll No. Check Rating
1 100 30
2 101 40
3 102 35
4 103 50
5 104 60
6 105 65
7 105 35
8 105 55
9 105 65
10 105 70

Resolution:

For the frequency chart, compute the frequecies as proven beneath. This desk present the no. of scholars scoring in given ranges.

Sr. No. Frequency College students
1 30-40 3
2 40-50 1
3 50-60 2
4 60-70 3
4 70-80 1

Following is the required frequency plot

Frequency plot

For the comulative frequency chart, compute the frequecies as proven beneath. This desk present the no. of scholars scoring upto given marks(together with).

Sr. No. Upto Rating College students
1 30 1
2 40 3
3 50 4
4 60 7
5 70 10

Following is the required frequency plot

Cumulative Frequency plot