## Pregunta de entrevista

Entrevista de Research Scientist

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# Throw a fair die 100 times, what is the probability that you will get more than 75 tails?

Respuesta

## Respuestas de entrevistas

5 respuestas

10

Umm...A die has six faces, so what's "heads"?

Anónimo en

0

You add up the binomial distribution for k = 76 to 100, i.e. (100 k) * p ^k * (1-p) ^ 100-k for p=1/2, where (100 k) is "100 choose k", the binomial coefficient. The idea is to figure out how many paths lead to each of the 101 final outcomes of the "tree" (which is defined by the "100 choose k" coefficients") and multiply each one by it's probability. Pascal's triangle makes things easy to think about.

Anónimo en

1

Approximate a Binomial distribution by a normal distribution.

Anónimo en

0

it should be (1/(2*76))

Lalit Goyal en

0

Probability should be : 1/(2 power 76)

Lalit Goyal en