Q14 of 141 Page 7























Classes:



25-29



30-34



35-39



40-44



45-49



50-54



55-59



Frequency:



14



22



16



6



5



3



4


Let the assumed mean (A) = 42











































































Class interval



Mid value (xi)



di = xi – 42



Ui =



Frequency (fi)



fiui



25-29



27



-15



-3



14



-42



30-34



32



-10



-2



22



-44



35-39



37



-5



-1



16



-16



40-44



42



0



0



6



0



45-49



47



5



1



5



5



50-54



52



10



2



3



6



55-59



57



15



3



4



12







N = 10



∑fiui = -79



We have, A = 42


h = 5


Mean = A + h *


= 42 + 5 *


= 42 -


=


= 36.357


More from this chapter

All 141 →
12





















Class interval:



10-30



30-50



50-70



70-90



90-110



110-130



Frequency:



5



8



12



20



3



2


 13



















Class interval:



25-35



35-45



45-55



55-65



65-75



Frequency:



6



10



8



12



4


 15

For the following distribution, calculate mean using all suitable methods:

















Size of items:



1-4



4-9



9-16



16-27



Frequency:



6



12



26



20


 16

The weekly observations on cost of living index in a certain city for the year 2004-2005 are given below. Compute the weekly cost of living index.



























Cost of living Cost of living



Number of Students



Cost of living Index



Number of students



1400-1500



3



1700-1800



9



1500-1600



10



1800-1900



6



1600-1700



20



1900-2000



2