A basket of fruits contains 10 bananas, 5 mangoes, and 5 apples. A fruit is selected at random. Calculate the probability of selecting an apple or a banana. Express the answer in percent form.
There are a total of 10+5+5 = 20 fruits in the basket.
The probability of selecting an apple or a banana is the sum of the individual probabilities of selecting an apple or a banana:
P(apple or banana) = P(apple) + P(banana)
P(apple) = 5/20 = 1/4
P(banana) = 10/20 = 1/2
Therefore,
P(apple or banana) = 1/4 + 1/2 = 3/4
To express the probability in percentage form, we multiply by 100:
P(apple or banana) = 3/4 x 100% = 75%