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Home » A class instructor has the accompanying truant record of 40 understudies of a class for the entirety term. Track down the mean number of days an understudy was missing. 0-6 6-10 10-14 14-20 20-28 28-38 38-40 Number of students 11 10 7 4 4 3 1
A class instructor has the accompanying truant record of 40 understudies of a class for the entirety term. Track down the mean number of days an understudy was missing. 0-6 6-10 10-14 14-20 20-28 28-38 38-40 Number of students 11 10 7 4 4 3 1
CBSE | Class 10 | Exercise 14.1 | Maths | NCERT | Statistics
A class instructor has the accompanying truant record of 40 understudies of a class for the entirety term. Track down the mean number of days an understudy was missing. 0-6 6-10 10-14 14-20 20-28 28-38 38-40 Number of students 11 10 7 4 4 3 1

Arrangement:

Discover the midpoint of the given stretch utilizing the equation.

Midpoint (xi) = (maximum cutoff + lower limit)/2

Class interval Frequency (fi) Mid-point (xi) fixi

0-6 11 3 33

6-10 10 8 80

10-14 7 12 84

14-20 4 17 68

20-28 4 24 96

28-38 3 33 99

38-40 1 39 39

Total fi = 40 Sum fixi = 499

The mean recipe is,

Mean = x̄ = ∑fixi/∑fi

= 499/40

= 12.48 days

Accordingly, the mean number of days an understudy was missing = 12.48.

i

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