IB MAI HL Statistics & Probability Topic 4.3 Probability (id: 89086fb5e)

本题目来源于试卷: IB MAI HL Statistics & Probability Topic 4.3 Probability，类别为 IB数学

[填空题]
In a college lottery, thu6obb1 (zk v8xere are two ,xp 5-pams- vhm44ncntypes of tickets: 'standard' tickets and 'lucky' tickets. Every student xc4 mh4s pmvn np5a,--is given one ticket at random. The total number of the standard tickets is four times greater than the number of lucky tickets.
The probability of winning the lottery with a standard ticket is $ \frac{1}{100} and \frac{1}{40}$ for a lucky ticket. The tree diagram below illustrates this.

1. Calculate the probability that a randomly chosen student will win the lottery.   
2. Calculate the probability that a randomly chosen student will get a lucky ticket and still lose the lottery.   
3. Calculate the probability that a randomly chosen student, given they won the lottery, had a standard ticket. ≈   

参考答案:
空格1: 0.013±2%  空格2: 0.195±2%  空格3: 0.615±2% 


本题详细解析:

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