Probability and Conditional Probability

SAT Math· difficulty 3/5

A survey of 250 people records gender and exercise habits. 80 men exercise daily, 60 men do not. 70 women exercise daily, 40 women do not. What is the marginal probability of being a woman?

  • A

    70/11070/110

  • B

    70/25070/250

  • C

    110/250110/250

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  • D

    140/250140/250

Explanation

Total women = 70+40=11070 + 40 = 110. P(woman)=110/250P(\text{woman}) = 110/250.

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