Question

find the mean median and mode of the followi d data
class interval
0-10
10-20
20-30
30-40
40-50
50-60.
60-70
frequency
3
4
7
15
10
7
4
​

Answer 1

To find the  mean, mode and median of the following data

Classes               0-10      10-20      20-30      30-40      40-50      50-60      60-70

mid points 5 15 25 35 45 55 65

Frequency 5 10 18 30 20 12 5

x i​ fi​

 25 150 450 1050 900 660 325

CF 5 15 33 63 83 95 100

∑f i

x i =3560

Total frequency =100

∴N= 2/100

​ =50,

Mean= 100/3560

​ =35.60,

Δ 1 =30−18=12,Δ 2 =30−20=10

30+5.4545= 35.4545