The probability that Darth Vader will encounter a droid when

The probability that Darth Vader will encounter a droid when he enters a turbolift is 80%. If Darth Vader rides 3 turbolifts in the next day, what is the expected number of droids that Darth Vader will encounter?

Can anyone please confirm the answer is 2.4? I am not sure if my answer is correct or not. Thank you

Solution

Note that

E(x) = n p

Here, n = 3, p = 0.80,

E(x) = 3*0.80 = 2.4 [ANSWER]

Yes, you are correct!