计算简单概率
Calculating Simple Probability
用等可能结果计算简单事件的概率，公式为：概率 = 有利结果数 ÷ 所有可能结果数；将结果化为最简分数；应用于掷骰子、从袋中摸球以及其他简单随机情境。
Calculate the probability of a simple event with equally likely outcomes using the formula: probability = number of favourable outcomes ÷ total number of possible outcomes; express the result as a fraction in its simplest form; apply to rolling dice, drawing from bags, and other simple chance situations
学习证据 / Evidence
- 计算从装有3个蓝球和7个红球的袋子中摸到蓝球的概率为3/10
- 使用公式 P(事件) = 有利结果数 ÷ 所有可能结果数，解决至少三道不同的问题
- 解释为什么增加有利结果的数量会增加概率
- Calculate the probability of drawing a blue marble from a bag of 3 blue and 7 red as 3/10
- Use the formula P(event) = favourable outcomes ÷ total outcomes to solve at least three different problems
- Explain why increasing the number of favourable outcomes increases the probability
评估问题 / Assessment
如果袋子里有3个红球和7个蓝球，{{name}}能算出摸到红球的概率，并用最简分数表示出来吗？
If there are 3 red and 7 blue balls in a bag, can {{name}} work out the probability of picking a red one and express it as a fraction in its simplest form?