Question

Javon's first 3 quizzes had a mean score of 90%. If he scores 46% on his next quiz, what will be his mean quiz score for these 4 quizzes?

Answer 1

`Mean = 79\%`

Explanation:

Given

`Mean_3 = 90\%`

`4th\ score =46\%`

Required

The mean of the 4 subjects

Mean is calculated as:

`Mean = (Total)/(n)`

For:
`Mean_3 = 90\%`

`Mean = 90\%\ n = 3`

So:

`90\% = (Total)/(3)`

`Total = 3 * 90\%`

`Total = 270\%` --- this is the total in the 3 subjects

The mean of the 4 subjects is:

`Mean = (Total\ of\ 4\ subjecte)/(4)`

`Mean = (270\% + 46\%)/(4)`

`Mean = (316\%)/(4)`

`Mean = 79\%`