Question: Suppose that ( mathrm{X} ) follows a Negative Binomial distribution with parameters ( r=4 ) and ( p=0.3 ). Similarly, ( Y ), independent of

Suppose that $ \mathrm{X} $ follows a Negative Binomial distribution with parameters $ r=4 $ and $ p=0.3 $. Similarly, $ Y $, independent of $ X $, follows a Negative Binomial distribution with parameters $ \mathrm{r}=2 $ and $ \mathrm{p}=0.3 $. Let $ \mathrm{Z}=\mathrm{X}+\mathrm{Y} $. Then, $ E(Z)= $

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