Thread: simple probablility ques.

300 discs of different colour.
100 pink, 100 blue and 100 orange.
each is numbered from 0-99
5 discs are selected at random. one and a time, with replacement.
what is the probability of getting exact 2 orange disc that ends with a 6?

i got 0.00984 and my friend got 0.00729
but no right answer yet. please help

Originally Posted by z1llch

300 discs of different colour.
100 pink, 100 blue and 100 orange.
each is numbered from 0-99
5 discs are selected at random. one and a time, with replacement.
what is the probability of getting exact 2 orange disc that ends with a 6?

X ~ Binomial(p = 10/300, n = 5)

Calculate Pr(X = 2).

alright thanks! =)