Question

Bob works at a construction company. He has an equally likely chance to be assigned

to work different crews everyday. He can be assigned to work on crews building
apartments, condominiums, or houses. If he works 21 days a month, about how many
times should he expect to be assigned to the house crew?
† Step-by-

Answer 1

`7` times.

Explanation:

We know that there are three buildings that he can be assigned to.

Since there are three buildings, the probability of each crew would be
`(1)/(3)`.

If you set up the proportion, it would look like this.

`(1)/(3)` =
`(x)/(21)`

The next step would be to solve for x.

`3x =21`

`x=7`