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 47-50 50-53 44-47 53-56 41-44 35-38 38-41 Number of days 4 7. 4 10 11 1 3 Number of students​

Answer 1

Answer:

okay

Mathematics is the study of numbers, shapes and patterns. The word comes from the Greek word "μάθημα" (máthema), meaning "science, knowledge, or learning", and is sometimes shortened to maths (in England, Australia, Ireland, and New Zealand) or math (in the United States and Canada). ... Numbers: how things can be counted.

Answer 2

Answer:

Mean Deviation Method :

No. of

days No. of

students

f

1

Mid-

point

x

1

d

1

=x

1

−17 f

1

×d

1

0 - 6 11 3 -14 -154

6 - 10 10 8 -9 -90

10 - 14 7 12 -5 -35

14 - 20 4 17 = a 0 0

20 - 28 4 24 7 28

28 - 38 3 33 16 48

38 - 40 1 39 22 22

n=40 -181

Here, a=17

n=40,∑f

1

d

1

=−181

By Mean Deviation Method.

X

ˉ

=a+

n

1

×∑f

1

d

1

=17+

40

1

×(−181)

=17−

4

18.1

=17−4.52

=12.48Days

∴ Mean number of days a student was absent = 12.48 Days.