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Statistics, Conditional Probability and Random Variables — Lesson quiz

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1.
In a group of 40 students, 25 play football, 18 play basketball and 10 play both. The probability that a football player also plays basketball is:
10/18
18/40
2/5
1/2
2.
A fair coin is tossed 4 times. The probability of exactly 2 heads is:
1/4
1/2
3/8
5/16
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