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prachi18oct
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If M is a negative integer and K is a positive integer, which of the following could be the standard deviation of the set
{-7,-5,-3,M,0,1,3,K,7} ?
1. -1.5
2, -1
3. 0
A) 1 only
b) 2 only
c) 3 only
d) 1 & 3 only
e) None
K+M-4/9 = Mean
now K = { 4,5,6}
M can be ={ -3,-2,-1}
I could not proceed from here ... picking up these numbers to put in S.D formula is just way too time taking.
I am sure there must be a quicker way !
Experts please help.
{-7,-5,-3,M,0,1,3,K,7} ?
1. -1.5
2, -1
3. 0
A) 1 only
b) 2 only
c) 3 only
d) 1 & 3 only
e) None
K+M-4/9 = Mean
now K = { 4,5,6}
M can be ={ -3,-2,-1}
I could not proceed from here ... picking up these numbers to put in S.D formula is just way too time taking.
I am sure there must be a quicker way !
Experts please help.
