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#### karush

##### Well-known member

- Jan 31, 2012

- 3,071

A discrete random variable $X$ has a probability distribution as shown in the table below.

1103

(a) Find the value of $a+b$

if the sum of $E[X] = 1$ then $1-0.1-0.3 =0.6=a+b$

(b) Given $E[X]=1.5$ find the value of a and b

why would this be $1.5$

1103

(a) Find the value of $a+b$

if the sum of $E[X] = 1$ then $1-0.1-0.3 =0.6=a+b$

(b) Given $E[X]=1.5$ find the value of a and b

why would this be $1.5$

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