Question

find class interval of 35-41​

Answer 1

Marks Number of student

30-35 5

35-40 8

40-45 15

45-50 20

50-55 5

55-60 4

65-70 2

70-75 3

Class mark =

2

upperlimit+lowerlimit

for 30-35 =

2

30+35

=32.5

for 35-40 =

2

35+40

=37.5

for 40-45=

2

40+45

=42.5