Find the positive value of x if the standard deviation of...
Find the positive value of x if the standard deviation of the numbers 1, x + 1, 2x + 1 is 6
1
2
3
4
Correct answer is C
mean (x) = 1+x+1+2x+13
= 3x+33
= 1 + x
X(X−X)(X−X)21−xx2x+1002x+1xx22x2
S.D = √∑(x−7)2∑f
= √(6)2
= 2x23
= 2x2
= 18
x2 = 9
∴ x = ± √9
= ±3
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