2007-12-07 03:19:23 · 26 answers · asked by Mike 1 in Science & Mathematics ➔ Mathematics
Thanks kendizzl I was looking for that equation. Btw I forgot how to figure that out =( sorry I suck at math. Nope those aren't my math exams grades I wish it was.
2007-12-07 03:27:49 · update #1
Let mark = X
90 = (94 + 88 + 86 + X) / 4
360 = (268 + X)
X = 92
Test score has to be 92
OR
Exam___Score___± 90
1_______94______+4
2_______88______- 2
3_______86______- 4
4_______X______+ 2
4th mark is 90 + 2 = 92
2007-12-07 04:52:27 · answer #1 · answered by Como 7 · 3⤊ 1⤋
(94 + 88 + 86 + x) / 4 = 90
(268 + x) / 4 = 90
268 + x = 360
x = 360 - 268
x = 92
therefor
the last score well be 92
2007-12-10 00:20:49 · answer #2 · answered by Rayan Ghazi Ahmed 4 · 0⤊ 0⤋
A 92....add 94+88+86+92=360...divide by 4=92
2007-12-07 03:24:46 · answer #3 · answered by maryfran 3 · 0⤊ 2⤋
The solution to your question can be represented by this equation: (94 + 88 + 86 + X) / 4 = 90. (Remember that in solving an algebraic linear equation, the cardinal rule is "what you do to one side of the equation you must also do to the other side.")
Adding the first three grades, you will get: (268 + X) / 4 = 90.
Solving for X is accomplished thus:
268 + X
----------- * 4 = 90 * 4 = 360
4
268 + X = 360
268 + X - 268 = 360 - 268 = 92
X = 92
2007-12-07 03:50:35 · answer #4 · answered by buckeyebrowser 1 · 0⤊ 3⤋
Average = sum of exam scores ÷ number of exams
90 = (94+88+86+x)/4
Solve for x
2007-12-07 03:25:51 · answer #5 · answered by DWRead 7 · 1⤊ 1⤋
How did you ever get a 94 or an 88 or an 86 on any math exam?
2007-12-07 03:22:31 · answer #6 · answered by optitkl 3 · 1⤊ 3⤋
Well you need AT LEAST a 92 to get an average of 90. You could also get a 91 and have an average of 89.75. Which rounded up is a 90. Then agian you could get a 90 and get an average of 89.5. So if your teacher rounds your grade up, 90, 91, or 92 will get an average of 90. You could always do better than that though and get a higher average. GOOD LUCK!
2007-12-07 03:32:30 · answer #7 · answered by Spicky & Grl ♥ 1 · 1⤊ 2⤋
(94 + 88 + 86 + X)/4 = 90
94 + 88 + 86 + X = 360
268 + X = 360
X = 360 - 268
X= 92
2007-12-07 03:24:34 · answer #8 · answered by alfie 2 · 0⤊ 2⤋
first get the sum of her attempt scores 87+ninety 4+seventy 9+86+ninety 4 = 440 then the divide it with the form of addends which you used.: 440 / 5 = 88 the respond is d. =) wide-spread is calculated by making use of including the numbers mutually, then dividing the total by making use of the quantity of numbers
2016-10-10 11:30:57 · answer #9 · answered by Anonymous · 0⤊ 0⤋
It's simple:
(94+88+86+x)=4*90
The value of 'x' will be the ans...
That's= 92.
2007-12-07 03:24:54 · answer #10 · answered by Anonymous · 0⤊ 2⤋
92
2007-12-07 03:25:00 · answer #11 · answered by Anonymous · 0⤊ 2⤋