Jim's second test score was 8 points lower than his first score, and his third score was 88. If his average for three tests was a B (80 to 87 inclusive), what can you conclude about his first score?
-
ok so im going to explain and tell you need your let statements
let the first test = X
let the second test =X-8
let the third test = 88
average: (X+X-8+88)/3= 83.5<-----------------------------------… picked the because that's the center of 80-87 cross multiply: X+X-8+88= 250.5
minus : 2X-8=162.5
ADD: 2X=170.5
Divide: X=85.25
Conclude that: the center of the rage of the first test fell near 85.25 so a range like (81.75-88.75)
if you can round which you can but i dont know if you want specific so it would be rounded (82-89) is where his first test fell
hope this helped let me know how i did rate best answer then leave me a note
let the first test = X
let the second test =X-8
let the third test = 88
average: (X+X-8+88)/3= 83.5<-----------------------------------… picked the because that's the center of 80-87 cross multiply: X+X-8+88= 250.5
minus : 2X-8=162.5
ADD: 2X=170.5
Divide: X=85.25
Conclude that: the center of the rage of the first test fell near 85.25 so a range like (81.75-88.75)
if you can round which you can but i dont know if you want specific so it would be rounded (82-89) is where his first test fell
hope this helped let me know how i did rate best answer then leave me a note