Question

# A coin is weighted so that there is a 65% chance that it will come up...

A coin is weighted so that there is a 65% chance that it will come up "heads" when flipped. The coin is flipped four times. Find the probability of at least one of the flips resulting in "tails". Round your answer to four decimal places.

Tossing a coin 4 times
P(at least 1 tail in 4 flips) = 1 - P(all heads in 4 flips)
= 1 - (0.65)^4
= 0.8215
So P(at least 1 tail in 4 flips) = 0.8215

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