Evaluating the graph of 81 student's test scores
Source: 1993 AMC 8 Problem 11
June 28, 2011
AMC
Problem Statement
Consider this histogram of the scores for students taking a test:[asy]
unitsize(12);
draw((0,0)--(26,0));
draw((1,1)--(25,1));
draw((3,2)--(25,2));
draw((5,3)--(23,3));
draw((5,4)--(21,4));
draw((7,5)--(21,5));
draw((9,6)--(21,6));
draw((11,7)--(19,7));
draw((11,8)--(19,8));
draw((11,9)--(19,9));
draw((11,10)--(19,10));
draw((13,11)--(19,11));
draw((13,12)--(19,12));
draw((13,13)--(17,13));
draw((13,14)--(17,14));
draw((15,15)--(17,15));
draw((15,16)--(17,16));draw((1,0)--(1,1));
draw((3,0)--(3,2));
draw((5,0)--(5,4));
draw((7,0)--(7,5));
draw((9,0)--(9,6));
draw((11,0)--(11,10));
draw((13,0)--(13,14));
draw((15,0)--(15,16));
draw((17,0)--(17,16));
draw((19,0)--(19,12));
draw((21,0)--(21,6));
draw((23,0)--(23,3));
draw((25,0)--(25,2));for (int a = 1; a < 13; ++a)
{
draw((2*a,-.25)--(2*a,.25));
}label("",(2,-.25),S);
label("",(4,-.25),S);
label("",(6,-.25),S);
label("",(8,-.25),S);
label("",(10,-.25),S);
label("",(12,-.25),S);
label("",(14,-.25),S);
label("",(16,-.25),S);
label("",(18,-.25),S);
label("",(20,-.25),S);
label("",(22,-.25),S);
label("",(24,-.25),S);label("",(2,1),N);
label("",(4,2),N);
label("",(6,4),N);
label("",(8,5),N);
label("",(10,6),N);
label("",(12,10),N);
label("",(14,14),N);
label("",(16,16),N);
label("",(18,12),N);
label("",(20,6),N);
label("",(22,3),N);
label("",(24,2),N);label("Number",(4,8),N);
label("of Students",(4,7),N);label("",(14,18),N);
[/asy]The median is in the interval labeled