Posted by **Jen** on Wednesday, July 20, 2011 at 10:08am.

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 ??

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**bobpursley**, Wednesday, July 20, 2011 at 10:37am
Since when can a probabliity be greater then one?

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**Jen**, Wednesday, July 20, 2011 at 10:47am
is it 180/500 = 2.7777???

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**bobpursley**, Wednesday, July 20, 2011 at 10:49am
Jen, think. How can 180/500 be more than one.

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**Ms. Sue**, Wednesday, July 20, 2011 at 10:49am
Jen!! 2.777 is also greater than one!

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**bobpursley**, Wednesday, July 20, 2011 at 10:53am
Prob of at least B is = prob of A +prob of B= (45+180)/totalofallgrades

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**Jen**, Wednesday, July 20, 2011 at 11:05am
oooooooh i totally messed up!!! sorry i did 500/180 instead of 180/500....so it would be 0.36....sorry :(

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**Ms. Sue**, Wednesday, July 20, 2011 at 11:58am
No.

You forgot to include the A grades.

Bobpursley explained that above.

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**Jen**, Wednesday, July 20, 2011 at 12:11pm
225/500 = 0.45??

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**Ms. Sue**, Wednesday, July 20, 2011 at 12:14pm
Right.

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**Jen**, Wednesday, July 20, 2011 at 1:39pm
great! i get it...thank u :)

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**Tychiana Murray**, Monday, July 25, 2011 at 4:21pm
the answer would be D 95

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