SOLUTION: a researcher was interested to study variations in number of deaths from two types of events. He considered number of deaths from HIV a random variable(x) and number of deaths from
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Question 997213: a researcher was interested to study variations in number of deaths from two types of events. He considered number of deaths from HIV a random variable(x) and number of deaths from a car accident a random variable (Y). He is interested in the total death due to the Two events. He named This random variable Z(Z=X+Y). What would be the mean for Z?
var (x)=2.3 and var (y)=1.8 Answer by mathmate(429) (Show Source):
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Given:
Two (assumed) independent variables X, Y, each with variance var(x)=2.3 and 1.8, and mean and respectively
To Find:
Mean of total, Z=X+Y.
Solution:
The mean of the sum of two independent variables X, Y
=
The variance of the sum of two independent variables X, Y
=
