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Question

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


Your Answer
A
6
Your Answer
B
2103 
Correct Answer
C
26 
Your Answer
D
453 

Solution

The correct option is C 26 
Mean=¯x=xn=1+0+1+k4=k4S.D.=(x)2n¯x=k2+24k216=53k2+816=5k2=24

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