Results 1 to 2 of 2

Math Help - range of one standard deviation from mean

  1. #1
    Member
    Joined
    Apr 2014
    From
    canada
    Posts
    242

    range of one standard deviation from mean

    range of one standard deviation from mean-img_20140615_091906-1-.jpg range of one standard deviation from mean-img_20140615_092016-1-.jpg

    my question is on part ii, my range ( as shown in the photo), is between 4.52 and 16.28, so my working would be (6+10+4+4)/(6+10+4+4+1) X100% ... the answer given is 72% which is differnt form my answer? which part of my working is wrong ?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Mar 2012
    From
    malaysia
    Posts
    105
    Thanks
    18

    Re: range of one standard deviation from mean

    Quote Originally Posted by delso View Post
    Click image for larger version. 

Name:	IMG_20140615_091906[1].jpg 
Views:	4 
Size:	456.1 KB 
ID:	31119 Click image for larger version. 

Name:	IMG_20140615_092016[1].jpg 
Views:	3 
Size:	767.5 KB 
ID:	31120

    my question is on part ii, my range ( as shown in the photo), is between 4.52 and 16.28, so my working would be (6+10+4+4)/(6+10+4+4+1) X100% ... the answer given is 72% which is differnt form my answer? which part of my working is wrong ?
    why (6+10+4+4)/(6+10+4+4+1) X100% ?
    you have found your domain, that is (4.52,16.28)
    you need to find the percentage of weeks that fall within this domain. so just check which weeks in your data do fall in this domain. for example, 10 does, 8 does, 7 does, but not 4, not 18, then 9 does, 14 does, and so on... altogether there's 18 that fall in this domain. then 18/25 x 100% = 72%
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: June 5th 2014, 06:34 PM
  2. Mean, Median, Range, IQR, Standard Deviation...
    Posted in the Statistics Forum
    Replies: 1
    Last Post: June 30th 2010, 11:04 PM
  3. Standard Deviation and Range
    Posted in the Statistics Forum
    Replies: 1
    Last Post: October 4th 2009, 05:37 AM
  4. Replies: 5
    Last Post: May 18th 2009, 05:14 AM
  5. standard deviation and mean deviation
    Posted in the Statistics Forum
    Replies: 1
    Last Post: March 16th 2008, 06:09 AM

Search Tags


/mathhelpforum @mathhelpforum