Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2013-12-10 13:01:00

mustangmar2001
Member
Registered: 2013-12-10
Posts: 1

### need help with a question.

a mean average of 60 on seven exam is needed to pass a course. on her first exams, paula received grades 51, 72, 80, 62, 57, and 69

B) an average of 70 is needed to get a C in the course. is it possible for Paula to get a C? if so what grade must she receive on the seventh exam?

C) if her lowest grade of the exams already taken is to be dropped, what grade must she receive on her last exam to pass the course?

D)if her lowest grade of the exams already taken is to be dropped, what grade must she receive on her last exam to get a C in the course?

someone please help...

Offline

## #2 2013-12-10 18:56:49

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,037

### Re: need help with a question.

Hi

Welcome to the forum!

Here are the setups for the problems:

For B): (51+72+80+62+57+69+x)/7=70. Solve this for x to get the answer.

For C): (72+80+62+57+69+x)/6=60. Solve for x again. Notice, though that there is no 51 in thetevsince that is the lowest result. Also, notice that the 7 is now a 6 since there are now a total of 6 results instead of 7.

For D): Do you have an idea how to set this up now?

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Offline

## Board footer

Powered by FluxBB