Discussion
Assuming that a box contains in all ten balls of which six are green and four are red, what is the probability of drawing a red ball ?
Answer: C
The probability of drawing a red ball is 0.4.
\[ \begin{aligned} P(\text{red}) &= \frac{\text{red balls}}{\text{total balls}} \\ &= \frac{4}{10} = 0.4 \end{aligned} \]
0.6 would be the probability of a green ball. 0.5 assumes the two colours are equally likely, 0.1 is the chance of one particular ball, and 1.0 would mean drawing red was certain.
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