Let x1,x2,x3 be random samples from a normal distribution with mean =1 & standard deviation=2. What is P(x1+2x2-2x3>7)?

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- November 22nd 2012, 12:20 PMalb41192Mean of normal distribution
**Let x1,x2,x3 be random samples from a normal distribution with mean =1 & standard deviation=2. What is P(x1+2x2-2x3>7)?** - November 22nd 2012, 09:43 PMchiroRe: Mean of normal distribution
Hey alb41192.

For this question be aware that the weighted sum of Normal distributions with means <a,b,c> and variances <x,y,z> where we are finding the linear combination of dX + eY + fZ has a normal distribution ~ N(da + eb + cf,d^2*x + e^2*y + c^2*z).

You can standardize this in terms of Z to get a probability by looking at tables or you can use a computer package like R which is really populat