anonymous
  • anonymous
Will medal and fan! Amanda's first four test scores are 77, 95, 84, and 69. What does Amanda need to score on the next test to have at least an 82 average? A) 85 or greater B) 90 or greater C) greater than 85 D) greater than 92
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Thanks for your help in advance! :)
anonymous
  • anonymous
hmm
FortyTheRapper
  • FortyTheRapper
Let's find the average of his first 4 test scores. What would that be?

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More answers

anonymous
  • anonymous
hmm
Landon34
  • Landon34
do you know how to find the mean?
anonymous
  • anonymous
yeah add the numbers then divide the number of numbers right?
Landon34
  • Landon34
yeah.
anonymous
  • anonymous
to the sum of all the numbers?
Landon34
  • Landon34
you add up all the numbers and then divide by the number of numbers
anonymous
  • anonymous
you add all the scores up and divided them by how many numbers you added up. In this case, you'd add 77, 75, 84, and 69. Then you divided by four because there are four numbers.
anonymous
  • anonymous
so in this case............. all combined would be 325 divided by 4 would be..............
anonymous
  • anonymous
total is 81.25
Landon34
  • Landon34
yep.
anonymous
  • anonymous
81.25!
Landon34
  • Landon34
you got it.
anonymous
  • anonymous
So what is it asking in this case?
FortyTheRapper
  • FortyTheRapper
Alright, so you got 81.25. Now if those 5 test are 100% of his grade, what % would each test be worth?
anonymous
  • anonymous
or what is the answer lol.
anonymous
  • anonymous
so dividing 100 and 5 would be..............
anonymous
  • anonymous
20%
anonymous
  • anonymous
20%, right
anonymous
  • anonymous
awesomesauce!
Landon34
  • Landon34
yeah
FortyTheRapper
  • FortyTheRapper
Right! Which would also be .20 out of 1. See how I got that part?
anonymous
  • anonymous
20 out of 1?
FortyTheRapper
  • FortyTheRapper
.20, not 20
anonymous
  • anonymous
.20 ok
anonymous
  • anonymous
20% = 0.20
FortyTheRapper
  • FortyTheRapper
So since you got those two numbers, multiply 81.25 and .20 for me That will give you his current grade
anonymous
  • anonymous
ok because 20% is some of it not all so it would be behind the decimal ok i get it.
anonymous
  • anonymous
ok.
FortyTheRapper
  • FortyTheRapper
And right
anonymous
  • anonymous
16.25?.....
FortyTheRapper
  • FortyTheRapper
Wait, my fault I meant multiply 81.25 and .80
anonymous
  • anonymous
oh ok lol
FortyTheRapper
  • FortyTheRapper
Because he's completed 4/5 test and 4/5 = .80 My bad
anonymous
  • anonymous
ooh 65%
FortyTheRapper
  • FortyTheRapper
Yes, so thats what he has
anonymous
  • anonymous
that is not a good or passing grade XD
Landon34
  • Landon34
lol
anonymous
  • anonymous
so what is the answer @FortyTheRapper?
Landon34
  • Landon34
in my school, 72% is passing.
anonymous
  • anonymous
cause 65% not a answer choice @FortyTheRapper
FortyTheRapper
  • FortyTheRapper
Now the grade he wants is a 82, but he has a 65.. so lets subtract 82 and 65
anonymous
  • anonymous
17%
FortyTheRapper
  • FortyTheRapper
That will get him the number of points out of the 20% he needs And right, 17/20
FortyTheRapper
  • FortyTheRapper
So last step is to convert 20 times ? = 100
anonymous
  • anonymous
yes
whpalmer4
  • whpalmer4
this is kind of a complicated way of doing it... If the student needs 82% average for 5 tests, each worth 100 points, and previous test scores are 77, 95, 84, and 69: \[\frac{\text{points earned}}{\text{points possible}} \ge 82\%\] But points earned will be \[77+95+84+69 +x\]where \(x\) is the score on the upcoming test. \[\frac{77+95+84+69 +x}{100+100+100+100+100} = 0.82\]will give the lowest score possible to get an \(82\%\) average.
anonymous
  • anonymous
5
anonymous
  • anonymous
20 times 5 is 100
FortyTheRapper
  • FortyTheRapper
Right, so to convert you would do the same to the top 17 times 5 = ? ----- 20 times 5 = 100%
anonymous
  • anonymous
17 times 5 is 85.
FortyTheRapper
  • FortyTheRapper
Right, so he would need a 85/100 to get that 82 average
anonymous
  • anonymous
correct!
anonymous
  • anonymous
so A?
FortyTheRapper
  • FortyTheRapper
Yep
anonymous
  • anonymous
ok tysm @FortyTheRapper here is your medal and fan!
anonymous
  • anonymous
closing question have a good day!
FortyTheRapper
  • FortyTheRapper
You too

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