Question

Marks scored by Lily in five spelling tests are:

20, 18, 22, 21, 19
Find her average score per test?

Answer 1

Answer:

20

Step-by-step explanation:

Average score = Total Marks/No of tests

=20+18+22+21+19/5

=100/5=20/1

=20

Therefore Lily's Average marks are 20

Answer 2

To find: average score per test .

Given data : marks scored by Lily are $20,18,22,21,19$

Solution :

• Average is the arithmetic mean.

• It is the ratio of sum of all the numbers given in data to the total number of observations.
• Formula: $Average =\frac{\text { sum of all the observations }}{\text { total of observations }}$

• Here, sum of observations $= 100$

• Total number of observations $= 5$

• Substituting values in above formula,

       $Average = \frac{100}{5}$

                      $= 20$

Hence , average score of Lily per test is $20$ .