beewrigh beewrigh
  • 27-10-2019
  • Mathematics
contestada

Chris has scored 78, 61, and 91 on his previous three tests. What score does he need on his next test so that his average (mean) is 78?

Respuesta :

flowilkinson
flowilkinson flowilkinson
  • 27-10-2019
(78+61+91+x)/4=78
Rearrange So
(230+x)= 78 x 4
230 + x = 312
x = 312-230
X= 82
Chris need to score 82
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