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Maria has scores of 96, 86, and 78 on three test. What must her average score be in order for her to have an average of at least 90?

Respuesta :

Marks scored in three tests = 96 , 86 , 78

Total of these scores = 260

Let the score that needs to be scored be = x

Average needed of four scores = 90

Average = total scores added of all subjects/number of subjects

[tex]\frac{96+86+78+x}{4}=90[/tex]

[tex]260+x=360[/tex]

[tex]x=100[/tex]

Hence, a score of 100 is required to make an average score of 90.


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