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order

  • 2 years ago

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).

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  1. order
    • 2 years ago
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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?

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

  3. order
    • 2 years ago
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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!! :(

  4. amorfide
    • 2 years ago
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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

  5. amorfide
    • 2 years ago
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    until then use khanacademy to learn

  6. guykubpom
    • 2 years ago
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    what is the answer you got from binomial contribution??

  7. order
    • 2 years ago
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    0.572

  8. guykubpom
    • 2 years ago
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    ummm I give up sorry lol

  9. order
    • 2 years ago
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    OK...

  10. guykubpom
    • 2 years ago
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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

  11. order
    • 2 years ago
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    the end answer should be 0.590

  12. order
    • 2 years ago
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    but don't know how to get to that.

  13. guykubpom
    • 2 years ago
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    hang in there lol

  14. order
    • 2 years ago
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    tryin :D

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