Just one sec...
Hey! Sign in to get help with your study questionsNew here? Join for free to post

Help with S1 question (Histograms)?

Announcements Posted on
Results day: make sure you know what to expect before you get your grades. Here's how to be ready. 22-07-2016
    • Thread Starter
    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?
    Offline

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

    ReputationRep:
    What did you think the width was for 4-7?
    • Thread Starter
    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.
    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
    • Thread Starter
    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. Oops, you need to agree to our Ts&Cs to register
  2. Slide to join now Processing…

Updated: February 19, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

Poll
Best social network/media?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read here first

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22

Registered Office: International House, Queens Road, Brighton, BN1 3XE

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