Question

following data is of 25 students arrange data in form of frequency distribution 15,16,16,17,18,18,17,15,15,16,16,17,15,16,15,16,16,18,15,17 ,17,18,10,16,15​

Answer 1

Answer:

Find the mean of the following frequency distribution.

Class interval 0−20 20−40 40−60 60−80 80−100 100−120 120−140

Frequency 4 15 23 12 16 8 2

December 27, 2019avatar

Praveen Chohan

ANSWER

CI  Frequency

f  

i

​  

  Mid−value

x  

i

​  

  f  

i

​  

x  

i

​  

 

0−20  4  10  40  

20−40  15  30  450  

40−60  23  50  1150  

60−80  12  70  840  

80−100  16  90  1440  

100−120  8  110  880  

120−140  2  130  260  

 ∑f  

i

​  

=80    ∑f  

i

​  

x  

i

​  

=5060  

⇒    

x

=  

∑f  

i

​  

 

∑f  

i

​  

x  

i

​  

 

​  

=  

80

5060

​  

=63.25

Step-by-step explanation: