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March 28, 2017

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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 - ,

    Since when can a probabliity be greater then one?

  • Math - ,

    is it 180/500 = 2.7777???

  • Math - ,

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

  • Math - ,

    Jen!! 2.777 is also greater than one!

  • Math - ,

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

  • Math - ,

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

  • Math - ,

    No.

    You forgot to include the A grades.

    Bobpursley explained that above.

  • Math - ,

    225/500 = 0.45??

  • Math - ,

    Right.

  • Math - ,

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

  • Math - ,

    the answer would be D 95

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