For one toss of a certain coin, the probability that the outcome is heads is 0.9. If this coin is tossed 5 times, which of the following is the probability that the outcome will be heads at least 4 times?  Choose the correct answer.
A) (0.9)^5  B) 2(0.9)^4  C) 3(0.9)^4  D) 4(0.9)^4(0.1) + (0.9)^5  E) 5(0.9)^4(0.1) + (0.9)^5
P(5 heads) = (0.9)^5   There are 5 ways to get 4 heads: HHHHT, HHHTH, HHTHH, HTHHH, THHHH   P(4 heads) = 5*(0.9)^4(0.1)   The answer is 5(0.9)^4(0.1) + (0.9)^5.
<result>E</result>
For one toss of a certain coin, the probability that the outcome is heads is 0.9. If this coin is tossed 5 times, which of the following is the probability that the outcome will be heads at least 4 times?