Question

Following is the frequency distribution of number of days when students were absent in a particular class: No. of students Number of days absent Below 10 Below 20 Below 30 Below 40 Below 50 Below 60 15 35 60 84 106 120 125 Below 70 30 Calculate D. and P, for the above data. Solution: Convert the data in groups and construct less than cumulative frequency table as follows:​

Answer 1

Step-by-step explanation:

Solution

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No. of students

absent (x) No. of days (f) fx

0 1 0

1 4 4

2 10 20

3 50 150

4 34 136

5 15 75

6 4 24

7 2 14

Σf=1+4+10+50+34+15+4+2

=120 Σfx=0+4+20+150+136+75+24+14

=423

Mean number of students absent per day (

x

ˉ

)=

Σf

Σfx

=

120

423

=3.525

Hence, the mean number of students absent per day is 3.525.

Answer 2

Answer:

Step-by-step explanation:

Following is the frequency distribution of number of days when students were absent in a particular class: No. of students Number of days absent Below 10 Below 20 Below 30 Below 40 Below 50 Below 60 15 35 60 84 106 120 125 Below 70 30 Calculate D. and P, for the above data. Solution: Convert the data in groups and construct less than cumulative frequency table as follow