Question

the average of upper limit of first class and lower limit of second class becomes the
a) upper boundary of second class
b) upper boundary of first class
c) both a and b
d) can't say

Answer 1

the average of upper limit of first class and lower limit of second class becomes the

b) upper boundary of first class

And the LOWER boundary of the second class

For example:
if the classes were as follows:

0-9
10-19
20-29

for 0-9 and 10-19,

average of 9 and 10 = 9.5

Now this 9.5 will be the upper boundary of 0-9(first class) and lower boundary of 10-19(second class)