9. Marry plays a game of throwing a ball at a target.
The table shows information about the probability of each possible score.
0
1
*
2
3
4
Score
0.09
Probability
X
3x
0.16
0.21
Marry is three times more likely to score 2 points than to score 1 point.
a) Work out the value of x.
b) Mary plays the game twice.
Work out the probability of Mary scoring a total of 8.
5
0.30
6.......