What are the values for the fx column?

Question

What are the values for the fx column? 

fx = Frequency*Score 

 

Class        Frequency   fx

51 - 60      3               

61 - 70      5

71 - 80      12

81 - 90       7

91 - 100     3

 

Thank you 

Answer 1

1. This is a grouped frequency distribution, so you need to find the class midpoints ( which will be the 'x' values) first using the following formula: Class mid-point=(lower limit of the class+ upper limit for the class)/2
2. So for the first class, the class midpoint is: (51+60)/2=55.5. This value if the 'x' for the first group.
3. The fx for the first group= f*x=3*55.5=166.5. This is the first entry for the third column, fx.
4. Similarly calculate rest of the 'fx column' entries.

Hope this is helpful.