Question

Kalvin tosses a coin five days in a row and gets tails everytime.Do you think there is something wrong with the coin? How can you find out?

Answer 1

there is probably something wrong because it should have been tail half and heads half the time.

Answer 2

The probability of that happening is only. 1/32 ... pretty small, but not impossible. I wouldn't blame the coin though, until he tosses it 100 or 200 times, and gets a split that's wildly different from 50-50.