A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive. (1 point)

Question

A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive.  (1 point)

anonymous · Answer

85 ≤  ≤ 90; 81 ≤ n ≤ 96
85 ≤   ≤ n; –2 ≤ n ≤ 3
90 ≤  ≤ 85; 96 ≤ n ≤ 81
83 ≤  ≤ 90; 73 ≤ n ≤ 94

tkhunny · Answer

$Total\;Average = \dfrac{83 + 91 + What}{3}$

anonymous · Answer

i still dont get it, its really confusing

tkhunny · Answer

Can you calculate the average of three values?

anonymous · Answer

what does that mean

tkhunny · Answer

Three values: 4 6 9.  What is the average of these three values?

anonymous · Answer

19/3??

tkhunny · Answer

Okay.  That's pretty good.  Now, just a little trickier, what is the average of three values when we don't actually know one of them?

What is the average of 83, 91, and Mystery Number "A"?

anonymous · Answer

87a

tkhunny · Answer

We're going to have to try to cummunicate better.  It is not okay just to drop some wild answer on the screen.  How did you get that?  What did you do?  Did you try anything new?  Talking is good.

How did you find the average of 4, 6, and 9?  Why would this new average use any other procedure?  do it EXACTLY the same way.