2 years ago

I need help on 5 please help fast

Mathematics

2 answers:

djyliett [7]2 years ago

8 0

the correct answer is 83.

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marysya [2.9K]2 years ago

6 0

The equation you would use is
mean= Test1+test2+test3+test4+test5+Test6+x/Total number of tests

so 83=89+78+69+81+89+90+X/7
First mutiple both sides by 7 so
581=496+X
you then substract the 496 and get 85
so she would need a 85 on the 7th test

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