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?

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

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

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

You're welcome. Im not familiar with MyMathLab

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

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

And thanks for becoming my student!

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?

I think they would be independent

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