Posted by Jen on .
Mr. Doodle’s grade distribution over the past 3 years for a course in college algebra is shown in the chart below.
Grade Number
A 45
B 180
C 110
D 95
F 65
I 5
If Jane plans to take a college algebra course with Mr. Doodle, determine the empirical probability that she receives at least a B. I think it's 1.7777 ??

Math 
bobpursley,
Since when can a probabliity be greater then one?

Math 
Jen,
is it 180/500 = 2.7777???

Math 
bobpursley,
Jen, think. How can 180/500 be more than one.

Math 
Ms. Sue,
Jen!! 2.777 is also greater than one!

Math 
bobpursley,
Prob of at least B is = prob of A +prob of B= (45+180)/totalofallgrades

Math 
Jen,
oooooooh i totally messed up!!! sorry i did 500/180 instead of 180/500....so it would be 0.36....sorry :(

Math 
Ms. Sue,
No.
You forgot to include the A grades.
Bobpursley explained that above. 
Math 
Jen,
225/500 = 0.45??

Math 
Ms. Sue,
Right.

Math 
Jen,
great! i get it...thank u :)

Math 
Tychiana Murray,
the answer would be D 95