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the number of points issac scores for collecting treasures is Y

Y=100X-50

Calculate the mean and the standard deviation of Y

 Oct 29, 2018
 #1
avatar+3567 
+1

\(E[a X + b] = a E[X] + b\\ \\ Var[a X + b]= a^2 Var[X]\\ \\ E[Y] = E[100X-50] = 100E[X]-50\\ \\ Var[Y] = Var[100X-50] = 10000Var[X]\)

 

I bet you have E[X] and Var[X] from some other part of the problem so plug those in.

 Oct 30, 2018

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