Question

A biased coin has a 0.8 probability of landing on heads and a 0.2 probability of landing on tails. The random variable X, based on a single toss of the coin, is defined as follows: X = 0 if heads appears; X = 1 if tails appears. What is the variance of X?

0.12

0.14

0.16

0.18

Answer 1

Which do you believe it is?

Answer 2

I dont know

Answer 3

what's 0.8 x 0.2?

Answer 4

.16

Answer 5

That is your answer :)

Answer 6

Thank you!