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Didn’t get the formula

Didn’t get the formula

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https://365datascience.teachable.com/courses/506102/lectures/9302985

   The Probability Frequency Distribution

 
 
I didn’t get the formula at 1:43

1 Answer

365 Team
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Hey Bulat, 
 
Thanks for reaching out!
 
In the formula, we’re using “.” to express multiplication, which might be what is confusing you. Overall, we’re just multiplying each outcome by its likelihood of occurring (P(X)*X) and adding them up (P(X_1)*X_1 + P(X_2)*X_2). 
 
Hope this helps!
Best, 
365 Vik