http://us.f6.yahoofs.com/hkblog/_9eQ...AcZHLB8i9hjJk4

i set up the equation P[ (X1+X2+...+X5)/5 < K ] = 0.3

then P[ z < ( 5K-(20)(5) )/ √(4)(5)] = 0.3

am i right???

if i am wrong, show me how to solve it please...

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- Dec 6th 2009, 12:13 AMkinproblem of normal distribution
http://us.f6.yahoofs.com/hkblog/_9eQ...AcZHLB8i9hjJk4

i set up the equation P[ (X1+X2+...+X5)/5 < K ] = 0.3

then P[ z < ( 5K-(20)(5) )/ √(4)(5)] = 0.3

am i right???

if i am wrong, show me how to solve it please... - Dec 6th 2009, 02:14 AMmr fantastic