huynhfamily2001 huynhfamily2001
  • 13-08-2020
  • Mathematics
contestada

lily scored her first Spanish test are 96, 85, 90, 92. What test score must lily earn on the 5th test so that her mean will be exactly 90.

Respuesta :

TigerLily06
TigerLily06 TigerLily06
  • 13-08-2020

Answer:

87

Step-by-step explanation:

[tex]\frac{96+85+90+92+x}{5} = 90\\[/tex]

[tex]\frac{353+x}{5} = 90[/tex]

[tex]353+x= 5(90)\\[/tex]

[tex]353+x=450[/tex]

[tex]x=87[/tex]

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