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anonymous

  • 5 years ago

Suppose the number of minutes a single, randomly selected student is asleep during a lecture is uniformly distributed between 7 and 14 minutes. (B) Over the course of the semester (say, 50 lectures), what is the probability that a randomly selected student will sleep a total of between 130 and 140 minutes?(Assume that the minutes slept in any lecture is independent of the number of minutes slept in any other lectures.) (C) How many lectures must a student attend to be 95% sure that they will that they will have slept at least 28 minutes in total?Use the quadratic equation to solve for Q(C).

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  1. anonymous
    • 5 years ago
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    for part (C) (Hint: replace x with sqrt(n) to solve for n)

  2. amistre64
    • 5 years ago
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    Suppose the number of minutes a single, randomly selected student is asleep during a lecture is uniformly distributed between 7 and 14 minutes.

  3. amistre64
    • 5 years ago
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    (B) Over the course of 50 lectures, what is the probability will sleep a total of between 130 and 140 minutes? (Assume that the minutes slept in any lecture is independent of the number of minutes slept in any other lectures.)

  4. amistre64
    • 5 years ago
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    this one i aint got any idea yet

  5. anonymous
    • 5 years ago
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    damn. ye its a statistics question

  6. amistre64
    • 5 years ago
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    it looks statisticy :) im in stats this semester; so give me about 3 months lol

  7. anonymous
    • 5 years ago
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    oh k. so youve never done confidence intervals or hypothesis tests before?

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