Results 1 to 6 of 6

Math Help - Normal Distribution

  1. #1
    Newbie Zora's Avatar
    Joined
    Aug 2010
    Posts
    8

    Question 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.And there is only 7 days but 14 watering periods so two watering periods a day.

    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?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,234
    Thanks
    27
    Quote Originally Posted by Zora View Post

    b .Water pressure problems occur in the system after 99% capacity is reached. On what percentage of the days were there problems?
    It seems to me to be as simple as \frac{3}{14} \times 100 =\dots
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie Zora's Avatar
    Joined
    Aug 2010
    Posts
    8
    No I doubt it because it is worth 3 marks somethign so simple wouldn't be worth so much.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by pickslides View Post
    It seems to me to be as simple as \frac{3}{14} \times 100 =\dots
    There are only seven days not fourteen

    CB
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Zora View Post
    No I doubt it because it is worth 3 marks somethign so simple wouldn't be worth so much.
    Is this assessed work? Does it contribute to you final grade?

    CB
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by Zora View Post
    No I doubt it because it is worth 3 marks somethign so simple wouldn't be worth so much.
    Then go back and look at your notes, because that is (when corrected, or using the answer in the other thread that you chose to ignore) the answer to the question as asked.

    CB
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 1
    Last Post: December 27th 2011, 01:08 PM
  2. normal distribution prior and posterior distribution proof
    Posted in the Advanced Statistics Forum
    Replies: 0
    Last Post: March 9th 2011, 06:12 PM
  3. Replies: 2
    Last Post: March 29th 2010, 02:05 PM
  4. Replies: 2
    Last Post: August 25th 2009, 10:39 PM
  5. Replies: 1
    Last Post: April 20th 2008, 06:35 PM

Search Tags


/mathhelpforum @mathhelpforum