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Crazy boy [7]
3 years ago
14

To pass a course with a B grade, a student must have an average of 80 or greater. A student’s grades on three tests are 73, 86,

and 78. Find what score the student must get on the next test to get a B average or better. What grade must the student get? ___ or greater.

Mathematics
1 answer:
rusak2 [61]3 years ago
7 0

To do this you need to know how to find an average. You add all of the values together and divide by the number of values you have. For this problem, we are missing one of the values so we will just call it x. Now we can make the equation and solve:

(73+86+78+x)/4=80

73+86+78+x=320

237+x=320

83=x

They need and 83% on their test to get a B overall.

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When I think about average with consecutive numbers, I think that it’s also the median. Let’s check.
If 12 is the median, there’s two numbers that are less than it and two that are more.
The list would be:
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Let’s check to see if the average is 12. To find average, you have to add all the numbers together and then divide that number by the quantity of numbers in the list.
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