Frequency Distribution?

• Jan 17th 2008, 12:23 AM
cu4mail
Frequency Distribution?
Hi all, plz help me on this..

The output in units of 20 employees during one week was as follows:
65, 69, 70, 71, 70, 68, 69, 67, 70, 68
72, 71, 69, 74, 70, 73, 71, 67, 69, 70

a) Start doing tabulation of given data. Make 5 classes by using suitable class interval.
b) Make the frequency distribution.
c) Also make the column of class mark.
d) Also find out the mean by constructing relevant column “f X”
e) Also compute relative frequency distribution and cumulative frequency distribution.
• Jan 17th 2008, 04:33 AM
colby2152
Quote:

Originally Posted by cu4mail
Hi all, plz help me on this..

The output in units of 20 employees during one week was as follows:
65, 69, 70, 71, 70, 68, 69, 67, 70, 68
72, 71, 69, 74, 70, 73, 71, 67, 69, 70

a) Start doing tabulation of given data. Make 5 classes by using suitable class interval.
b) Make the frequency distribution.
c) Also make the column of class mark.
d) Also find out the mean by constructing relevant column “f X”
e) Also compute relative frequency distribution and cumulative frequency distribution.

Sort the date in ascending or descending order. You have 20 employees, but you would like 5 classes. These classes do not have to be the same sample size, so make their intervals equal the length of: $\frac{MAX-MIN}{5}$.

Your frequency distributions depend on your classes.
• Jan 17th 2008, 04:36 AM
CaptainBlack
Quote:

Originally Posted by cu4mail
Hi all, plz help me on this..

The output in units of 20 employees during one week was as follows:
65, 69, 70, 71, 70, 68, 69, 67, 70, 68
72, 71, 69, 74, 70, 73, 71, 67, 69, 70

a) Start doing tabulation of given data. Make 5 classes by using suitable class interval.
b) Make the frequency distribution.
c) Also make the column of class mark.
d) Also find out the mean by constructing relevant column “f X”
e) Also compute relative frequency distribution and cumulative frequency distribution.

The largest is 74 and the smallest 65 and you want 5 classes that and that the data are all integers suggests that we use 63-65, 66-68, 69-70, 71-73, 74-77 as our classes.

RonL
• Apr 22nd 2009, 11:41 AM
nitro777
Hello,
Why does it not matter that the lower class limits and upper class limits can sometimes arbitrarily fall below and above the actual data?

Just looking at this from a new perspective, it seems like it should matter.

Thanks,
Jason