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Probability

This topic has 1 reply, 2 voices, and was last updated 1 year ago by Cath.

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May 3, 2021 at 12:40 pm #619536
rania9
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- Topics: 3
- Replies: 3
A survey was carried out to find out whether the mode of travel to work differed significantly between commuters aged over and under 30. 60 commuters were interviewed, half from each age group. Twice as many under 30s took a car to work compared with taking public transport and only one over 30 used public transport. 25% of the commuters walked, three-fifths of whom were over 30.
What is the probability that a motorist is under 30?
The answer is 0.44 but ..
Could you please explain the answer of the below?
Thank you
June 1, 2021 at 5:53 pm #622685
Cath
Member
- Topics: 0
- Replies: 423
So its 45 commuters
15 walkers
Of the 15 (there are 6 under 30)
So thats 24 left.
Of this 2:1 ratio car to public thus 16 in car…
16/36 is 0.4444
Hope thats ok
Cath
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