Statistic(S1). PLEASE HELP!!!

Can anyone please explain this question.

A box contains 300 discs of different colours. There are 100 pink discs, 100 blue discs and 100 orange
discs. The discs of each colour are numbered from 0 to 99. Five discs are selected at random, one at
a time, with replacement. Find

(i) the probability that no orange discs are selected,

(ii) the probability that exactly 2 discs with numbers ending in a 6 are selected,

(iii) the probability that exactly 2 orange discs with numbers ending in a 6 are selected,

(iv) the mean and variance of the number of pink discs selected.

Reply 1

m4ths/maths247

7

Original post by _Abdur

Can anyone please explain this question.

A box contains 300 discs of different colours. There are 100 pink discs, 100 blue discs and 100 orange
discs. The discs of each colour are numbered from 0 to 99. Five discs are selected at random, one at
a time, with replacement. Find

(i) the probability that no orange discs are selected,

(ii) the probability that exactly 2 discs with numbers ending in a 6 are selected,

(iii) the probability that exactly 2 orange discs with numbers ending in a 6 are selected,

(iv) the mean and variance of the number of pink discs selected.