Looking for trustworthy answers? Westonci.ca is the ultimate Q&A platform where experts share their knowledge on various topics. Join our Q&A platform to get precise answers from experts in diverse fields and enhance your understanding. Join our platform to connect with experts ready to provide precise answers to your questions in different areas.
Sagot :
Answer:
x/y = 5/9
Step-by-step explanation:
sum = count * mean
for the group of x students:
sum = x * 76
let's say this sum is a
a = 76x
for the group of y students:
sum = y * 90
let's say this sum is b
b = 90y
total sum = total count * total mean
total sum = total sum from both groups = a + b
total count = total count from both groups = x + y
a + b = (x+y) * 85
expand
a + b = 85x + 85y
a = 76x
b = 90y
replace a with 76x and b with 90y in the first equation. this limits the equation to x and y, which we want because we want to find x/y
76x + 90y = 85x + 85y
subtract 76x and 85y from both sides to limit the amount of numbers
5y = 9x
divide both sides by 9 to isolate the x
(5/9)y = x
divide both sides by y to get x/y
x/y = 5/9
Your visit means a lot to us. Don't hesitate to return for more reliable answers to any questions you may have. We hope you found what you were looking for. Feel free to revisit us for more answers and updated information. Get the answers you need at Westonci.ca. Stay informed by returning for our latest expert advice.