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order

In Scotland in November on average 80% of days are cloudy. Assume that the weather on any one day is independent of the weather on other days. (i) use normal approximation to find the probability of there being fewer than 25 cloudy days in Scotland in Novermber (30 days).

  • one year ago
  • one year ago

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  1. order
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    I used binomial contribution, which gave an exact answer, but I have to use the normal distribution to get an approximation. Any idea?

    • one year ago
  2. amorfide
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    best i can help is by giving you this http://www.khanacademy.org/ scroll down to statistics

    • one year ago
  3. order
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    I know you have to use np and npq, but I have no clue how, and this site doesn't help much... sorry!! :(

    • one year ago
  4. amorfide
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    this site is very helpful but you can not expect everyone to have been taught the same things as you... we will help when we can but we can't help if we have no knowledge of it... just keep bumping your question until someone answers

    • one year ago
  5. amorfide
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    until then use khanacademy to learn

    • one year ago
  6. guykubpom
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    what is the answer you got from binomial contribution??

    • one year ago
  7. order
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    0.572

    • one year ago
  8. guykubpom
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    ummm I give up sorry lol

    • one year ago
  9. order
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    OK...

    • one year ago
  10. guykubpom
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    but fewer than 25 days is 24 days which is 80 percent of 30 days so it should be 0.5 if 24 days is a mean idk I get confused

    • one year ago
  11. order
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    the end answer should be 0.590

    • one year ago
  12. order
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    but don't know how to get to that.

    • one year ago
  13. guykubpom
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    hang in there lol

    • one year ago
  14. order
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    tryin :D

    • one year ago
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