To get a grade of B, a student must have a mean average of 80. Pat Mast has a mean average of 79 for 10 quizzes. He approaches his teacher and asks for a B, reasoning that he missed a B by only one point. What is wrong with his reasoning?
2006-08-17 03:21:45 · 10 answers · asked by thotfulcute 2 in Science & Mathematics ➔ Mathematics
he missed the mark for a B by one point, but 10 times!
therefore, 1x10 = 10.
in reality he's 10 points off.
if he were to sit another test, he would need to get a 90 to have a mean score of 80, and thus, a B
2006-08-17 03:29:24 · answer #1 · answered by Sula 1 · 2⤊ 0⤋
He didn't miss it by 1. He actually missed a B by 10 points. What you need to do is to realize that there were 10 quizzes. He would have had to get at least 80% 10 times to get a B. He didn't He got 79 10 times.
Here's how:
If a grade of B is an 80 and he kept getting 79's and there were 10 quizzes, then he missed the 80 by 10 points. ie (80-79) *10.
You can also figure it this way:
80*10 = 800.
-79*10 = 790
10 points.
2006-08-17 13:06:58 · answer #2 · answered by mikeae 6 · 0⤊ 0⤋
His reasoning isn't really reasoning at all. He is asking for a break, that's all. If the requirement is an average of 80, he fell short and should get a C. The reason is this: If the teacher gives him a B, then the new requirement for a B is a 79 (because any other student that got a 79 should also get a B). So if Fred got a 78, he missed the requirement by only one point. Now if Fred asks for a break, he will have grounds to claim that other students were given a break when they missed the mark by one point, so why can't he have a break? If the teacher gives Fred a break, then Sam, who got a 77 only missed the new B cutoff (78) by one point, and on and on. No breaks!
2006-08-17 10:40:35 · answer #3 · answered by 1,1,2,3,3,4, 5,5,6,6,6, 8,8,8,10 6 · 1⤊ 0⤋
On average, he missed a B every time. He had ten opportunities to raise his grade to a B. The fact that he did not, is his fault.
Total points Pat got = 79 * 10 tests = 790 points
Total points for a B = 80 * 10 tests = 800 points
he missed a B by a total of 10 points
he missed a B by 1 point per test
2006-08-17 10:38:20 · answer #4 · answered by mommy_mommy_crappypants 4 · 1⤊ 0⤋
He didn't miss B by one point, he missed B by one point times 10 quizzes. Hence, by 10 points.
But he should still get the B.
2006-08-17 11:41:00 · answer #5 · answered by Krzysztof_98 2 · 1⤊ 0⤋
It would've taken him 10 extra points on either tests to get and average of 80
2006-08-17 10:29:45 · answer #6 · answered by Marc L 2 · 1⤊ 0⤋
he missed it by 1average point out of 10 quizzes. need to figure out how many points would have got him 80
2006-08-17 10:26:33 · answer #7 · answered by Anonymous · 0⤊ 0⤋
since it is an average it is the sum of his results divided by the number so he missed by n marks where n is the number of tests
2006-08-17 10:27:08 · answer #8 · answered by Anonymous · 0⤊ 0⤋
idk?! man i thought i was good at math i want 6th grade problems on here not whatever grade u learn that in!? =)
2006-08-17 10:35:47 · answer #9 · answered by Anonymous · 0⤊ 0⤋
i'm srry but i really don't feel like doin anykind of math wat so ever!
2006-08-17 10:27:28 · answer #10 · answered by Jan 1 · 0⤊ 2⤋