This histogram represents the scores from the last geometry test. They are graphed with a bin width of 7.
a) How many students took the test?
To find the total number of students, we need to add the number of times each score occurs (each score's frequency).
Total = 1 + 4 + 2 + 3 + 4 + 1 = 15 students
b) What percentage of students scored above 78?
To find the percentage we need to divide the number of students who scored above 78 by the total number of students (15). 8 students scored above 78 (add up the last three bars).
c) Which interval contains the median?
Since there are 15 scores, the median (middle) score will be the 8th score. This will be located between 178-185.