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the average of the five number was 6.8. If the first four numbers were 4.3, 5.2, 7, and 6.8, What was the fifth number?

Respuesta :

ElenaClairmont
Let x be the fifth number
[tex] \frac{4.3 + 5.2 + 7 + 6.8 + x}{5} = 6.8[/tex]
⇔ [tex] \frac{23.3 + x}{5} = 6.8[/tex]
⇔ 23.3 + x = 34
⇔ x = 10.7

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