Question

# If the standard deviation of the numbers −1,0,1,k is √5, then k is equal to:

A
6
B
2103
C
26
D
453

Solution

## The correct option is C 2√6 Mean=¯x=∑xn=−1+0+1+k4=k4S.D.=√∑(x)2n−¯x=√k2+24−k216=√5⇒3k2+816=5⇒k2=24

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