Solve the equation 
for 
.
Definitions:
Probability Model
A probability model is a mathematical representation of a random phenomenon, consisting of a sample space, events within the sample space, and probabilities associated with each event.
Random Variable X
A variable whose possible values are numerical outcomes of a random phenomenon.
Number Of Children
The count of offspring a person or population has.
Probability Model
A mathematical representation that defines the likelihood of various outcomes in a random process.
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