Math Is Fun Forum

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...

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

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?

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