If average of four members is 20 and average of their squares is 500, then average of their products taken two at a time, is:

If average of four members is 20 and average of their squares is 500,

1.	If average of four members is 20 and average of their squares is 500, then average of their products taken two at a time, is:
A.	366.7
B.	475
C.	550
D.	650
Answer» B. 475

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If average of four members is 20 and average of their squares is 500, then average of their products taken two at a time, is:

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