Results are out! Find what you need...fast. Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Help with S1 question (Histograms)?

Announcements Posted on
  1. Offline

    ReputationRep:
    In a particular week, a dentist treats 100 patients. The length of time, to the nearest minute , for each patient's treatment is summarised below.

    Time(minutes): 4 - 7
    Number of patients: 12

    Time(minutes): 8
    Number of patients: 20

    Time(minutes): 9 - 10
    Number of patients: 18

    Time(minutes): 11
    Number of patients: 22

    Time(minutes): 12-16
    Number of patients: 15

    Time(minutes): 17-20
    Number of patients: 13

    Draw a histogram to illustrate these data.

    The only bit which I don't understand is where the class width is 0 i.e. in the 8th and 11th minute. What's the frequency density for these 2?
  2. Offline

    ReputationRep:
    for 8 the width is 1, from 7.5 to 8.5
  3. Offline

    ReputationRep:
    What did you think the width was for 4-7?
  4. Offline

    ReputationRep:
    (Original post by TenOfThem)
    What did you think the width was for 4-7?
    3 ain't it? So the frequency density is 4 since 12/3 = 4.
  5. Offline

    ReputationRep:
    (Original post by Dr.Pwepper)
    3 ain't it? So the frequency density is 4 since 12/3 = 4.
    No

    the width is 7.5 - 3.5 = 4

    So the density is 3
  6. Offline

    ReputationRep:
    (Original post by TenOfThem)
    No

    the width is 7.5 - 3.5 = 4

    So the density is 3
    Ah yes, I forgot about the upper and lower bound.

    Thanks!

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: February 19, 2012
New on TSR

Your TSR exam season toolkit

Everything you need to know about study help on TSR

Study resources
Article updates
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.