Hi all I am having problems with this: L.C-U.C Frequency Class Mark Class Freque

Question

Hi all I am having problems with this: L.C-U.C
Frequency
Class Mark
Class Frequency
Class Boundary
Cummuliative Frequency
0-9
7
4.5
7/15 -.5 - 9.5
       7
10-19
4
14.5
4/15
9.5-19.5
       11
20-29
2
24.5
2/15
19.5-29.5
       13
30-39
0
34.5 0 29.5-39.5
       13
40-49       2               44.5    2/15         39.5-49.5          15

I understand almost everything, the only thingI need help with is how in the hell you get the CLASS BOUNDARY. Please ifanyone can show me the rule for the CLASSBOUNDARY. Thank you so much, PLEASE show all work.
Will give a LIFESAVER., Thank You.
L.C-U.C
Frequency
Class Mark
Class Frequency
Class Boundary
Cummuliative Frequency
0-9
7
4.5
7/15 -.5 - 9.5
       7
10-19
4
14.5
4/15
9.5-19.5
       11
20-29
2
24.5
2/15
19.5-29.5
       13
30-39
0
34.5 0 29.5-39.5
       13

Explanation / Answer

Take the avrage of difference between first class upperinterval and second class lower interval, we get a constant say itis k i.e., k=(10-9)/2          =0.5 subtract this constant from lower limit of the firstclass , and add this constant to upper limit. Do this to allthe class intervals i.e., the lower and upper boundaries of the first classare respectively       0-0.5=-0.5       9+0.5=9.5 The class boundary is halfway between the upper limit of oneclass and the lower limit of the next. The use of class boundaries in histograms assure us that thebars of the histogram touch and fall on the boundaries

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