Question

A class teacher has the following attendance record of 40 students of a class for the whole term. Find the mean number of days a student was present out of 56 days in the term













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Answer 1

Answer:

Hey Dear,

● Answer -

Mean = 49 days

◆ Explanation -

For this we have to calculate fi.xi for each class.

For class 35-38,

fixi = 36.5 × 1

fixi = 36.5

For class 38-41,

fixi = 39.5 × 3

fixi = 118.5

For class 41-44,

fixi = 42.5 × 4

fixi = 170

For class 44-47,

fixi = 45.5 × 4

fixi = 182

For class 47-50,

fixi = 48.5 × 7

fixi = 339.5

For class 50-53,

fixi = 51.5 × 10

fixi = 515

For class 53-56,

fixi = 54.5 × 11

fixi = 599.5

Summation fixi will be -

Σfixi = 36.5 + 118.5 + 170 + 182 + 339.5 + 515 + 599.5

Σfixi = 1961

Mean no of days each student attended school will be -

Mean = Σfixi / Σfi

Mean = 1961 / 40

Mean = 49.05 days

Therefore, mean no of days a student was present in school is 49 days.

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