Question

sams pen contains 3 red, 2 blue, and 5 black pens. he takes a pen out without looking then puts it back 100 times. roughly how many times would you expect him to pick up a red pen

Answer 1

30 times

Explanation:

P(X = red) =
`(3)/(3+2+5)`

`=(3)/(10)`

Expectation =
`(3)/(10) *100`

= 30