makenzieboyette504 makenzieboyette504

12-06-2018
Mathematics

contestada

Keiko has scored 86, 91, 86, 61, and 87 on her previous five tests. what score does she need on her next test so that her average (mean) is 84?

Respuesta :

12-06-2018

x= grade on next test

Add up all scores, divide by 6 and this equals the average of 84

(86 + 91 + 86 + 61 + 87 + x)/6= 84
add in parentheses

(411 + x)/6= 84
multiply both sides by 6

411 + x= 504
subtract 411 from both sides

x= 93

ANSWER: 93 is needed on the next test to have an average of 84

Hope this helps! :)

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