A fair 2 sided coin is flipped 8 times. What is the probability that tails will be the result at least twice, but not more than 8 times?
Select:
A) 5/8
B) 3/4
C) 7/8
D) 157/64
E) 143/128
at least twice, but not more than 8 timesmeans exactly 2 times, 3 times, 4 times, 5 times, 6 times, 7 times, 8 times   The probability of getting exactly k results out of n flips is nCk/2^n   8C2/2^8+8C3/2^8+8C4/2^8+8C5/2^8+8C6/2^8+8C7/2^8=143/128   Option: 143/128
<result>E</result>
A fair 2 sided coin is flipped 8 times. What is the probability that tails will be the result at least twice, but not more than 8 times?