Interactive practice questions
In an experiment, several balls coloured either green or black and numbered $1$1 to $11$11 are placed in a bag. The table show all outcomes in the sample space. What is the probability that a ball drawn at random:
| green | black | |
| 1 | × | × |
| 2 | × | × |
| 3 | × | × |
| 4 | × | × |
| 5 | × | × |
| 6 | × | × |
| 7 | × | |
| 8 | × | |
| 9 | × | |
| 10 | × | |
| 11 | × |
a
is black?
b
has the number $2$2?
c
has the number $7$7?
d
has a number $3$3 or higher?
Medium
1min
1000 computers were tested at a factory with 15 found to be faulty. What is the experimental probability that a computer at this factory will be faulty?
Easy
< 1min
Of $50$50 people buying coffee at a cafe, $39$39 bought a latte.
Easy
< 1min
The table shows the fighting style used by the winner in each mixed martial arts tournament fought last year.
Medium
3min
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