100
(78 + 56)/2 = 67
The pattern rule for the sequence 97, 88, 78, 67 is that each number decreases by 9. Starting from 97, subtracting 9 gives 88; subtracting 9 from 88 results in 78, and subtracting 9 from 78 gives 67. Thus, the next number in the sequence would be 67 - 9 = 58.
91
91
The median of two numbers is also their mean = (78+56)/2 = 67
The average is 56.
=78 X100 /56 139.2
The sum of 67 and 78 is 145.
134
110
134
1.3929