Why 3/10 + 4/10 Is The Answer In The Question What Is The Probiality That Brian Will Wear A Blue Or A Red Shirts

why 3/10 + 4/10 is the answer in the question what is the probiality that brian will wear a blue or a red shirts

 

Answer:

If its not possible for both events A or B to occur, then add the probability of the occurrence of two events.

P(A or B) = P(A) + P(B)

Step-by-step explanation:

The probability that a blue or a red shirt will be worn be Brian is mutually exclusive.

If the event is mutually exclusive (clue: the word "or"), then this addition rule applies:

P(A or B) = P(A) + P(B)

Lets say:

Total possible outcome (total number of shirts): 10

Blue shirt (A): 3

P(Blue): 3/10

Red shirt (B): 4

P(Red): 4/10

Then:

P(Blue or Red) = P(Blue) + P(Red)

P(Blue or Read) = 3/10 + 4/10

P(Blue or Red) = 7/10


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