The outcome of each of 30 items was observed; 10 items gave an outcome \(\frac{1}{2}-d\) each, 10 items gave outcome 1/2 each and the remaining 10 items gave outcome \(\frac{1}{2}+d\) each. If the variance of this outcome data is 4/3 then |d| equals:

The outcome of each of 30 items was observed; 10 items gave an outcome

1.	The outcome of each of 30 items was observed; 10 items gave an outcome \(\frac{1}{2}-d\) each, 10 items gave outcome 1/2 each and the remaining 10 items gave outcome \(\frac{1}{2}+d\) each. If the variance of this outcome data is 4/3 then \|d\| equals:
A.	2/3
B.	2
C.	\(\frac{\sqrt{5}}{2}\)
D.	√2
Answer» E.