# Math

posted by 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 ??

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Since when can a probabliity be greater then one?

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is it 180/500 = 2.7777???

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

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Jen!! 2.777 is also greater than one!

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

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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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No.

You forgot to include the A grades.

Bobpursley explained that above.

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225/500 = 0.45??

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Right.

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great! i get it...thank u :)

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the answer would be D 95

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