Assume that the only grades possible in a history course are A, B, C, and lower than C. The pro

To find the probability that a student will get an A OR a B, we simply add the probabilities of

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Assume that the only grades possible in a history course are $\mathrm{A}, \mathrm{B}, \mathrm{C}$, and lower than $\mathrm{C}$. The probability that a randomly selected student will get an A in a certain history course is $0.18$, the probability that a student will get a $\mathrm{B}$ in the course is $0.25$, and the probability that a student will get a $\mathrm{C}$ in the course is $0.37 .$ a. What is the probability that a student will get an A OR a B? b. What is the probability that a student will get an A OR a B OR a C? c. What is the probability that a student will get a grade lower than a $\mathrm{C}$ ?

          Assume that the only grades possible in a history course are $\mathrm{A}, \mathrm{B}, \mathrm{C}$, and lower than $\mathrm{C}$. The probability that a randomly selected student will get an A in a certain history course is $0.18$, the probability that a student will get a $\mathrm{B}$ in the course is $0.25$, and the probability that a student will get a $\mathrm{C}$ in the course is $0.37 .$
a. What is the probability that a student will get an A OR a B?
b. What is the probability that a student will get an A OR a B OR a C?
c. What is the probability that a student will get a grade lower than a $\mathrm{C}$ ?

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