Question

Marks less than 0 to 10 ten to Twenty 20 to 30 30 to 40 40 to 50 50 to 60 60 to 70 frequency 822 4468 8496 4 find the main median and mode

Answer 1

Answer:

In the given frequency distribution , h=10

Class 20−30 has maximum frequency. i.e., 25

Therefore, 20−30 is the model class in which l=20 and f

m

=25.

Here, f

1

=12 and f

2

=13

Mode=l+(

2f

m

−f

1

−f

2

f

m

−f

1

)×h

=20+(

50−12−13

25−12

)×10

=20+

25

130

=20+5.2

=25.2 (Ans)