slojswahj6145 slojswahj6145

06-12-2018
Mathematics

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Carlos has scored 83, 81, and 73 on his previous three tests. What score does he need on his next test so that his average (mean) is 83 ?

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jimrgrant1 jimrgrant1

06-12-2018

Answer:

95

Step-by-step explanation:

let x be his mark in the fourth test, then

mean = [tex]\frac{83+81+73+x}{4}[/tex] = 83 ( multiply both sides by 4 )

83 + 81 + 73 + x = 332

237 + x = 332 ( subtract 237 from both sides )

x = 95

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