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On his first three tests, Ken scored 83,79, and 96. What score must he get on his fourth test to have an average (mean) of
80 for all four tests?​

Respuesta :

Answer:

62

Step-by-step explanation:

average = [tex]\frac{totalscore}{count}[/tex]

Let x represent his fourth score, then

[tex]\frac{83+79+96+x}{4}[/tex] = 80, that is

[tex]\frac{258+x}{4}[/tex] = 80 ( multiply both sides by 4 )

258 + x = 320 ( subtract 258 from both sides )

x = 62

He must obtain a score of 62 in his fourth test

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