(i) A box contins 80 discs, which are numbered from 1 to 80. If one disc is drawn at random from the box, find the probability that it bears a perfect

Correct Answer - A `(a)` `1234ul(5678910)` `1^(st)` drawn is `5`, then `2^(nd)` drawn can be `1` only. If `1^(st)` is `6`, then `2^(nd)` is `1` or `2` and so on. ltbr...

Correct Answer - `(43)/(50)`

Correct Answer - `1//5`

Correct Answer - `13/204`

Correct Answer - `"Mean "=(6)/(4), "variance "=(30)/(49)`

Correct Answer - `(i) 9/20 (ii) 7/20 (iii) 4/5 (iv) 11/20 (v) 13/20`

Correct Answer - `4/13`

Correct Answer - `(191)/(200) `

Let X be the random variable defined as the number of red balls. Then X = 0, 1 P(X = 0) = \(\frac{3}{4}\times\frac{2}{3}=\frac{6}{12}=\frac{1}{2}\) P(X = 1) = \(\frac{1}{4}\times\frac{3}{3}+\frac{3}{4}\times\frac{1}{3}=\frac{6}{12}=\frac{1}{2}\) Probability Distribution Table: X 0 1 P(X) \(\frac{1}{2}\) \(\frac{1}{2}\)

The required probability = P((The first is a red jack card and The second is a jack card) or (The first is a red non-jack card and The second is...