Probability
Probability
IP 4
A spinner is equally likely to stop at any angle. Its three sectors are:
| Colour | Sector angle |
|---|---|
| Red | \(180^\circ\) |
| Blue | \(120^\circ\) |
| Green | \(60^\circ\) |
Find \(P(\text{red})\).
Find \(P(\text{not blue})\).
Explain why “there are three colours, so each has probability \(\frac13\)” is incorrect.
Solution:
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Answer:(a) \(\frac12;\) (b) \(\frac23;\) (c) Sector angles are unequal.
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