In a school ‚24 student absent today .If 726 students are present ‚then find the total number of students in the school.
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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.
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