Survey

We know the mean is 21 and SD of 6 !!

So on the graph(which actually not needed here )

it says it was between 1 and 2 SD below mean!!

that is left side of the bell curve !

so the value has to lie betwwen 2sd=9 and 1 sd=15

15-9 is the range !! so

only number which fits the spot

---- 12

Vishu

KILL !! DIE !! or BEAT my FEAR !!! de@D END!!

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sumittaneja009: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Sat Nov 08, 2008 4:36 am

by sumittaneja009 » Sun Nov 23, 2008 6:45 am

Thanks!

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