Question

Find the mean of first 8 whole numbers:
A) 3
B) 3.5
C) 4
D) 4.5

Answer 1

Hint:
0, 1, 2, 3, 4, 5, 6,7, 8, 9, 10,… are whole numbers starting from 0 to infinity, the arithmetic mean of the first 8 whole numbers will fetch you the result. For that we need to add up all the numbers and then divide the result by number of numbers.

Complete step by step solution:
The numbers which are starting from 0 are called whole numbers, 0,1,2,….n are called whole numbers.
Mean of first 8 whole numbers is,
$
   \Rightarrow x = \dfrac{{0 + 1 + 2 + 3 + 4 + 5 + 6 + 7}}{8} \\
   \Rightarrow x = \dfrac{{0 + 1 + 2 + 3 + 4 + 5 + 6 + 7}}{8} \\
   \Rightarrow x = \dfrac{{28}}{8} \\
   \Rightarrow x = 3.5 \\
 $

So, the mean of first 8 whole numbers is 3.5.

Note:
Arithmetic mean is the ratio of data in the data set to the number of data in the data set, whole numbers are the numbers starting with zero. Mean is a useful tool for data related works because sometimes they use to fill missing numbers with the mean of that category.