statistics question help

Statistics
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Only grades possible are A,B,C, or lower than a C. Probability of an A is .40, B is .28, C is .11

What is

probability of an A or B?

Probability of an A,B, or C?

Probability of lower than a C?

Feb 7th, 2015

A or B: .40+ .28= .68

A, B, or C: .40+ .28+ .11= .79 

Lower than C: .40+ .28+ .11= .79

1- .79= .21

With probability, the sum must equal to 1

Feb 7th, 2015

Kiyana, TY so much for the prompt help. Are you familiar with MyMathLab?

Feb 7th, 2015

If you're interested I have a timed stats quiz, 45 min, and a homework assignment I would pay you for.

Feb 7th, 2015

You're welcome. Im not familiar with MyMathLab

Feb 7th, 2015

Web based assignment. Log in do the assignment, log out.

Feb 7th, 2015

Ok. Thanks for the reference, I'll be sure to check it out! 

Feb 7th, 2015

And thanks for becoming my student!

Feb 7th, 2015

My pleasure. So check this out.

9% of people are left handed. women are about 6 times as likely to be left handed as men. Are gender and handedness independent or associated?

Feb 7th, 2015

I think they would be independent 

Feb 7th, 2015

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