5 items = a mean of 98
6 items =mean of 102
possible anwers 25,24,117,122
please show how to do
If you have 5 items with a mean of 98, then the sum of all items is 5*98 = 490
If you have 6 items with a mean of 102, the total is 6*102 = 612
Other than that we know nothing. Now, if you meant to say that adding the 6th item raised the mean from 98 to 102, then the 6th item accounts for all the change: 122.