Question: -0.5, -0.67, -2/3, -13/20, -17/25
Answer: = −19
/6
Answer:

Step-by-step explanation:
Given
Represent Fred with F; Norman with N and Dave with D.


Required
Determine the arithmetic mean of F and N
First, we have that:

Substitute 44 for D

Subtract 44 from both sides


Arithmetic mean of F and N is calculated as follows:



The sum of the first n natural number = n * (n+1) / 2, for n a natural number.
For example, you want to calculate the sum and average of any five numbers entered by the user. i.e., If you want to calculate the sum and average or percentage of multiple user-entered numbers, then please refer to the following program.