A) 7
B) 9
C) 12
D) 14
Correct Answer: D
Solution :
[d] Standard deviation \[=\sigma =d\sqrt{\frac{{{n}^{2}}-1}{12}}\] d= size between each observation = 7 n= total number of observation = 7 \[\therefore \sigma =7\sqrt{\frac{{{(7)}^{2}}-1}{12}}=7\sqrt{\frac{49-1}{12}}\] \[=7\sqrt{\frac{48}{12}}=7\times 2=14\]
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