Questions
. If the sum of deviations of a number of observations about 4 is 30 and that about 3 is 40. Then, mean of the observations is
a
7
b
10
c
11
d
None of these
detailed solution
Correct option is A
Given that,∑i=1n xi−4=30and ∑i=1n xi−3=40i.e..,Σxi−4n=30 (i)and Σxi−3n=40 ..(ii)On solving Eqs. (i) and (ii), we getn=10 and Σxi=70∴∑i=1n xi Mean =110(70)=7Talk to our academic expert!
Similar Questions
Following are the marks obtained by 9 students in a mathematics test:
50, 69,20,33, 53,39, 40, 65, 59
The mean deviation from the median is
799 666 8865
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