21Lazy to search for the definition of ''standard deviation''. Would you like to define it ?
The men square deviation of a set of n observations x1,x2,x3,.....xn about a point c is defined as
\left(1/n \right)\sum_{i=1}^{n}{\left(x_{i}-c \right)^{2}}
The mean square deviation about -2 and 2 are 18 and 10 respectively, then standard deviation of this set of observation is
a) 3
b) 2
c) 1
d) none of these
SOURCE: TMH Mathematics for AIEEE
Answer: 3
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4 Answers
21
1standard deviation means square root of (mean square deviation about mean)
71You are given two set of values, this will help you to find n and c. Then you're done.
