Plz solve the following
Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by 70 keeping all other observations same , find the new mean?
A. 40.6
B. 40.4
C. 40.3
D. 40.7
Answers
Answered by
37
sum of observation=mean×no. of observation
sum of observation=40×100
sum of observation=4000
sum of observation after replacing 30 by 70
=(sum of observation-30)+70
=(4000-30)+70
=3970+70
=4040
new mean=sum of new observation/no. observation
new mean=4040/100
new mean=40.4
sum of observation=40×100
sum of observation=4000
sum of observation after replacing 30 by 70
=(sum of observation-30)+70
=(4000-30)+70
=3970+70
=4040
new mean=sum of new observation/no. observation
new mean=4040/100
new mean=40.4
ameeshahas399:
U are so helpful
Answered by
8
The answer is B - 40.4
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