Probability of X<4 for X~Bi(5,0.2)

[Madou]

For a random value X~Bi(5,0.2) evaluate the probability of X<4.
Any ideas?
What is Bi?

 

[Madou]

Other things i want to evaluate about the random value X~Bi(5, 0.2):
1) M[2-3x]
2)D[2-3x]

 

[HallsofIvy]

Hey, it's your problem. You should be the one who knows what terms and symbols you are using! If I had to guess, it would be that "Bi(5, 0.2)" is the binomial distribution with and event with probability of success 0.2 repeated 5 times. I would also guess that "M" is the mean value and D is "standard deviaton". But again, it is your course. Those terms should be defined in your text or notes.

 

[Madou]

thank you, i'll check it all out )