1.) 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 30 days a month, about how many times should he expect to be assigned to the house crew? Bob can expect to be assigned to the house crew about

times out of 30 days.

2.) A bag contains 30 red marbles, 8 white marbles, and 7 gray marbles. You randomly pick out a marble, record its color, and put it back in the bag. You repeat this process 180 times. How many white or gray marbles do you expect to get?

If you randomly pick out a marble and replace it 180 times, you can expect

white or gray marbles to be chosen.

3.) n a standard 52−card deck, half of the cards are red and half are black. The 52 cards are divided evenly into 4 suits: spades, hearts, diamonds, and clubs. Each suit has three face cards (jack, queen, king), and an ace. Each suit also has 9 cards numbered from 2 to 10.

Suppose a solitaire player has played 900 games. Predict how many times the player turned over a red card as the first card.

The player can expect to turn over a red card about

times.