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Math Help - finding the shape,sd and mean

  1. #1
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    finding the shape,sd and mean

    im having trouble finding (basically everything) i cant seem to figure out the problem with the given numbers.

    In the problem it says that 39% of housholds have a dog in your city and that you takes a simple random sample of 50 households.


    basically wer have to describe the shape, mean, and standard deviation.

    i assume the .39 is the population mean and 50 is the sample observtion. i could be all wrong though. help please!
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  2. #2
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    Quote Originally Posted by lunaj View Post
    im having trouble finding (basically everything) i cant seem to figure out the problem with the given numbers.

    In the problem it says that 39% of housholds have a dog in your city and that you takes a simple random sample of 50 households.


    basically wer have to describe the shape, mean, and standard deviation.

    i assume the .39 is the population mean and 50 is the sample observtion. i could be all wrong though. help please!
    The number of a of households with a dog in a sample of 50 has a binomial distribution B(50,0.39) , which we know has mean 0.39 \times 50=18.5, and a standard deviation of \sqrt{50 \times 0.39 \times (1-0.39)}

    RonL
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  3. #3
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    thank you so much!

    im taking the course online so it keeps getting harder and harder. i dont think we've gone over the binomial thing or how to find a mean the way you did. so far its been given to us or there are multiple numbers and we find the mean.
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