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Math Help - normal distribution?

  1. #1
    Newbie Zora's Avatar
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    Exclamation normal distribution?

    I cant figure this out have been working on it for hours. Confused on part b.

    1. Because of water shortages during a drought in a Canadian city, watering of lawns and gardens was permitted only from 06:00 to 09:00 and from 19:00 to 22:00. The peak consumption, as a percentage of total system capacity, was recorded each watering period for a week in July. Assume that the water consumption was normally distributed.

    88, 95, 65, 94, 67, 94, 75,
    93, 77, 100, 85, 100, 85, 100

    a. Find the mean and the standard deviation.
    = 87, σ = 11

    b .Water pressure problems occur in the system after 99% capacity is reached. On what percentage of the days were there problems?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by Zora View Post
    I cant figure this out have been working on it for hours. Confused on part b.

    1. Because of water shortages during a drought in a Canadian city, watering of lawns and gardens was permitted only from 06:00 to 09:00 and from 19:00 to 22:00. The peak consumption, as a percentage of total system capacity, was recorded each watering period for a week in July. Assume that the water consumption was normally distributed.

    88, 95, 65, 94, 67, 94, 75,
    93, 77, 100, 85, 100, 85, 100

    a. Find the mean and the standard deviation.
    = 87, σ = 11

    b .Water pressure problems occur in the system after 99% capacity is reached. On what percentage of the days were there problems?
    On three days consumption reached or exceeded 99% capacity, out of a total of seven days.

    CB
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  3. #3
    Flow Master
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    Duplicate post. Thread closed.
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