Question

If a fair die is rolled 7 times, what is the probability, rounded to the nearestthousandth, of getting at least 4 threes?

Answer 1

If a fair die is rolled 7 times, what is the probability, rounded to the nearest

thousandth, of getting at least 4 threes?

we have that

probability that get three is

P=1/6

and the probability that get other number is P=5/6

therefore'

the probability that get at least 4 threes is

P=C(7,4)*(1/6)^4*(5/6)^3

P=C(7,4)*(1/1,296)*(125/216)

Find out C(7,4)

C(7,4)=7!/(7-4)!*3!)=