6. Two coins are tossed, find the probability that two heads are obtained.
- 0.25
- 0.1
- 0.5
- 0.7
7. A jar contains 3 red marbles, 7 green marbles and 10 white marbles. If a marble is drawn from the jar at random, what is the probability that this marble is white?
- 0.6
- 0.3
- 0.5
- 0.27