If a coin is flipped 20 times, what are the odds of getting 15 or more tails?
Do this by hand (no calculators / equations) please. and please write NEAT.
n = 20
x = 15
p = 0.5 (probability of tail)
So,
P(x ≥ 15) = 20C15 * 0.5^5 * 0.5^15 + 20C16 * 0.5^4 * 0.5^16 + ........+ 20C20 * 0.5^0 * 0.5^20
P = 0.02
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