IB MAI HL Statistics & Probability Topic 4.3 Probability (id: 762ee53f5)

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]
The first two characters of a stud u/q.(o.qgtzoi1; jfbw )7c oyent ID number is composed by the foll6lnkyi 0o*.kx*:ko9(i hzb gfcu+n -nowing rules h i kc0 lyu(z.:6*i+xngk9* ono-nbkf:
- one letter is chosen from student's first name at random;
- one digit is chosen from student's date of birth at random (dd/mm/yyyy).

Bob Stewart was born on the 12th of January, 2001(12/01/2001). Find the probability that
1. Bob's ID starts with "B1".   
2. Bob's ID starts with "B" or its second character is "2".   
3. Bob's ID starts with "O" given that the second character is not 0 . ≈   

参考答案:
空格1: 0.25±2%  空格2: 0.75±2%  空格3: 0.333±2% 


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