The average score Willis in all 8 tests will be calculated as 86.5
The average is defined as the number that is calculated by adding quantities together and dividing the total by the number of quantities.
It is given in the question that
The average score on the first 3 tests was 84
[tex]84=\dfrac{T_1+T_2+T_3}{3}[/tex]
The Sum of the score in all three tests will be
[tex]T_1+T_2+T_3=252[/tex]
The average score on the next 5 tests was 88
[tex]88=\dfrac{T_4+T_5+T_6+T_7+T_8}{5}[/tex]
The Sum of the score in all five tests will be
[tex]T_4+T_5+T_6+T_7+T_8=440[/tex]
Now to calculate the average score of all 8 tests will be calculated as
The Sum of all scores of all tests will be
[tex]T_1+T_2+T_3+T_4+T_5+T_6+T_7+T_8=252+440=692[/tex]
The average will be equal to
[tex]\dfrac{T_1+T_2+T_3+T_4+T_5+T_6+T_7+T_8}{8}[/tex]
[tex]=\dfrac{692}{8}=86.5[/tex]
Hence the average score Willis in all 8 tests will be calculated as 86.5
To know more about the average follow
https://brainly.com/question/4931057
