How do you find fx from the given frequency table?

Answer 1

You multiply the number in the "X" column (the event column) by the corresponding number in the Frequency column (i.e the "how many times the event happended" column).

If you have a frequency table, showing how many red cars were spotted in consecutive hours on the same stretch of road: Let "X"=number of red cars. (Please imagine the lines of the table, data is the same style in each column, i.e bold is X, italic is F and plain is Fx. )

X Frequency

X=1 10

X=2 2

X=3 4

X=4 3

This data shows that the total number of hours spent watching for red cars was 19 (the total of the F column). It also shows that on 10 occasions, only one red car was seen per hour, on 2 occasions only 2 red cars were seen per hour etc...

Now Fx is the value in the X column multiplied by the frequency, i.e:

X Frequency Fx

X=1 10 10

X=2 2 4

X=3 4 12

X=4 3 12

Total Fx is the number of red cars seen in total: 38