assume the probability of getting head from a biased coin is 0.35.
what would be the probability that out of 100 randomly toss, at least 22 of them are head ?

Question

assume the probability of getting head from a biased coin is 0.35.
what would be the probability that out of 100 randomly toss, at least 22 of them are head ?

alexwee123 · Answer

do 0.35 to the power of 22 
and get 9.321x10^-11

alexwee123 · Answer

to get the percentage multiply the answer by 100 and get 9.321x10^-9 % of getting 22 heads

anonymous · Answer

.... and I don't think it's the correct answer.

alexwee123 · Answer

why not? o-0

anonymous · Answer

from your method, then out of two toss least one of them is head would be 0.35^1 which is 0.35
though the correct answer would be 0.8225

alexwee123 · Answer

ohh wait i didnt see the 100 tosses... sorry

alexwee123 · Answer

wait then it should be 7.7% chance cause 22 has to at least be head and there is a 35% chance of it being heads so its (22/100) x (35/100) which equals =0.077