Question

Oscar's spinner has scores from 1 to 4. The table shows the probabilities of scores 1, 2 and 3

1=0.1
2=0.5
3.0.1
4=?
Work out 4

Answer 1

hello! all the probabilities will add up to 1, so just subtract each of these to find 4.
1-0.1-0.5-0.1=0.3

4 had a probability of 0.3