Help me please:  Assume X~Possion(λ). Use the definition of expectation to find E[X]

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Help me please: 

Assume X~Possion(λ). Use the definition of expectation to find E[X]

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Step 1: Introducing the given information

L e t space X space b e space a space p o i s s o n space r a n d o m space v a r i a b l e space w i t h space p a r a m e t e r space lambda space t h e n
T h e space p r o b a b i l i t y space m a s s space f u c t i o n space o f space p o i s s o n space d i s t r i b u t i o n space i s space g i v e n space b y
X tilde P o s s i o n left parenthesis lambda right parenthesis
P left parenthesis X equals x right parenthesis equals fraction numerator e to the power of negative lambda end exponent lambda to the power of x over denominator x factorial end fraction space space space space space x equals 0 comma 1 comma 2...

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