Independent random variable with mean
Given that X1,X2,X3, and X4 are independent random variable with mean 2 and variance 4, find E(Y) and E(Z) for :
Y=3X4-X1+(0.2X3
Z= X2+7X3-9X1
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Suppose a charge of -2.10 µC is at the origin and a charge of 2.90 µC is at the point (0, 3.00) m. (a) Find the electric potential at (4.00, 0) m, assuming the electric potential is zero at infinity.
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