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weekly profit:1-10, 11-20, 21-30,  31-40,  41-50,  51-60



frequency;6,  6,  12,  11,  1o,  5                                                                                                                                                                a. draw the cummulative frequency graph of the dstimate tata                                                                                                                      b.from your graph estimate i)median  ii)80th percentile



Posted in Math, asked by barbara, 6 years ago. 1733 hits.


Hi, I think I can help with this. 

Cumilitive frequency just mean 'adding it up as you go along' 

Draw a table with 3 rows and 6 columns. Row one will be the weekly profit, Row 2 will be the frequency. Row 3 will be the cumilative frequency.  Add up the frequencies as you go. (I.e. 6, 12, 24, 35, 45, 50)

You then want to plot a graph with cumilative frequency up the y axis and weekly profit along the x-axis (the point you plot will be the cumilitive frequency and upper limit of the weekly profits - i.e. (6, 10);(12, 20);(24, 30) etc join the points up with a curve (the curve should look like a very gentle 's' shape)

Median is the middle value, exactly half way up the y-axis and then read across to your curve, read down to find the x-axis value. 
80th percentile requires you to split your cumilative frequency data into 100 groups ..fairly easy as your total is 50, (80/100 is the same as 40/50) so simply read across from 40 on your y-axis to the curve then read down to find the x-axis value.

Hope this helps even without the graph, if I have the time I'll draw the graph for you and post a picture later. Good luck. 

Kerry Olssen
Kerry Olssen - 6 years ago
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