Question 1190746
for 0 alive is 0.2^3=0.008
for 1 alive is 3*0.2^2*0.8=0.096
for 2 alive is 3*0.2*0.8^2=0.384
for all 3 it is 0.8^3=0.512
they add to 1, as they should.

answers
a. 0.384
b. is 0 or 1 with prob. 0.104
c. at least 1 is 1- p(0)=0.992
d. The probability distribution is above.
Sometimes it is just easier to write down the whole probability distribution and then answer the questions, when there are several questions. When n is small and the decimals are straightforward, it almost always is easier.