calculate mean,median.mode from following data:

Question

marks                            NO. of students

more than 0                            80

   "       "   20                          76

   "       "   40                          50

   "       "   60                          28

   "       "   80                          18

   "       "  100                          9

   "       "  120                          3

Answer 1

Set up a table with the following columns:

 

   class

boundaries    marks     freq    mark x freq   cum. freq    percentile

----------------------------------------------------------------------------

0   -  20          10           4

20 -  40          30          14

40 -  60          50          26

60 -  80          70          22

80 - 100         90            9

100-120         110          6

120-140         130          3

 

You should have learned in class how to use the data from this table to find what you are looking for.

 

Any questions comment back.