Fredy’s Car Puzzle



Fredy decided to go on a long drive with his girl friend on a deserted highway to discuss about his marriage with a condition that, if she solves the puzzle – Fredy will marry her, otherwise he will say bye to her on the highway. Fredy asked his girl friend, on this deserted highway, the probability of observing a car during a thirty-minute period is 95 percent. What is the chance of observing a car in ten-minute period? Please help her to marry Fredy!

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13 Responses to Fredy’s Car Puzzle

  1. mauni says:

    can i get the soln?

  2. RAHUL R NAIR says:

    31.6 %

  3. loratis says:

    Rahul, you have missed one assumption while solving perhaps you got the different answer

  4. anusha says:

    approximate 32 %

  5. shravan says:

    Let p be the probability of seeing a car in 10
    Then probability of not seeing a car is
    1-p
    so (1-p)^3=0.05
    so p=0.631.

  6. Rishabh tripathi says:

    Let p is a probability to see a car in 10 minutes.
    Then (1-p) is probability NOT to see a car in 10 minutes.
    Then probability NOT to see a car in 30 minutes is (1-p)*(1-p)*(1-p).
    (1-p)^3 == 0.05
    So p = 1-0.05^(1/3)~ 0.63

  7. Rishabh tripathi says:

    ur welcome sir!!!

  8. revathy says:

    63.1%

  9. revathy says:

    63.1% sir

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