Fofy1013
Fofy1013 Fofy1013
  • 17-05-2017
  • Mathematics
contestada

I need help on 5 please help fast

I need help on 5 please help fast class=

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Cheetah0710 Cheetah0710
  • 17-05-2017
 the correct answer is 83.

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hollymoppelt
hollymoppelt hollymoppelt
  • 17-05-2017
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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