Respuesta :
Let the unknown test score be x.
Average = 85
[tex] \frac{68 + 78 + 90 + 91 + x}{5} = 85[/tex]
[tex] \frac{327 + x}{5} = 85[/tex]
327 + x = 425
x = 98
Thus, the lowest score needed to be earned is 98.
Average = 85
[tex] \frac{68 + 78 + 90 + 91 + x}{5} = 85[/tex]
[tex] \frac{327 + x}{5} = 85[/tex]
327 + x = 425
x = 98
Thus, the lowest score needed to be earned is 98.
Answer:
98 is the lowest score that you can earn on the next test and still achieve an average of at least 85.
Step-by-step explanation:
Math test scores are: 68, 78, 90, and 91
Average of the math test score = A = 85
Let the lowest score needed to achieve an average of 85 be x
Average = [tex]\frac{\text{Sum of terms}}{\text{Number of terms}}[/tex]
[tex]A=\frac{68+ 78+ 90+91+x}{5}[/tex]
[tex]85=\frac{68+ 78+ 90+91+x}{5}[/tex]
[tex]68+ 78+ 90+91+x=425[/tex]
[tex]x=425-(68+ 78+ 90+91)=98[/tex]
98 is the lowest score that you can earn on the next test and still achieve an average of at least 85.
