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In this example, we have a bar graph that displays
Midterm Exam Grades for
the number of students in a given class. So I'm going to start by looking at
each of the pieces of the bar graph, and then identifying the numbers that go with
them. So it looks like 4 students
earned an A on the midterm, and 7 students earned a B,
and 9 students earned a C,
and 3 students earned a D,
and 2 students earned an F. If I add those
I'm going to get 25 students total.
That information might come in handy
as we work through the questions on the right side of this table.
So part A says: How many students made a B on the midterm? So we know
that from reading our table already,
that would be 7 students made a B
on the midterm. How many students were in the class?
Well we figured that out already too, that would be 25
students were in the class. What percentage
of the class made a B on the midterm? Well 7 students made a B
so I want to answer the question:
7 is what percent of 25?
So there's my percent question,
I can set up a percent equation,
7 equals X times 25
and to solve that equation I would take
and divide by 25 on both sides,
so I get X equals 7 over 25
if I divide there I get 0.28,
and converting that to a percent
would mean 28% of the students made a B
on the midterm. What percentage of the students made a passing grade
of A, B, or C? Well if I add up those numbers
I get 7 plus 4 is 11, plus 9, that would be 20.
So I'm going to say 20, and if I follow my model from
this example, I can just divide twenty by twenty five,
and that gives me 0.80,
and if I change that to
a percent I get 80%