Math Is Fun Forum

samuel baffoe

Member

Registered: 2010-08-25

Posts: 5

stem and leaf, box plot

the ff. stem and leaf plot shows the lifetime in hours of 15 long life light bulbs and 15 ever bright light bulbs

long life                ever bright

               71    
               72             5
6 3 1 0       73             1
9 9 8 7 6 2   74             6
9 7 3 0       75       2
                   76             0 2 2 5 7
               77             1 1 3 4 6 8
1               78            
                   79

1. represent this information on a box plot
2. give a good reason why someone might prefer a long life light bulb give supporting details
3. give a good reason why someone might prefer an ever bright light bulb give supporting details

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: stem and leaf, box plot

Hi samuel baffoe;

Sorry but the data is all squiggly on my browser, can you format it a little better. If you can't this site will help you draw your box plot

http://www.physics.csbsju.edu/stats/box2.html

and give important statistical data. That you can bring here and we can work on questions 1,2,3.

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,649

Re: stem and leaf, box plot

Hi Samuel,

Looking at your stem and leaf I'm suspecting the stems are 71, 71, 73 etc and the leaves are .5, .1 etc.

To get proper alignment how about this method:

Use Excel or a table in Word or something similar if you haven't got that software to make the stem and leaf as given.
Then press the PrtSc button to take a 'screen shot' of the table.
Load Paint or a similar graphics program and paste in your screen shot.
Save it as a GIF file and attach the image to a new Post reply (not Quick post).
Then we can see your data properly.

Bob

Last edited by Bob (2010-12-28 02:13:29)

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob