A basket of fruit 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.
The total number of fruit in the basket is 10 + 5 + 5 = 20.
The probability of selecting an apple or a banana is the sum of the probabilities of selecting an apple and selecting a banana.
Probability of selecting an apple = Number of apples / Total number of fruit = 5 / 20 = 1/4
Probability of selecting a banana = Number of bananas / Total number of fruit = 10 / 20 = 1/2
Probability of selecting an apple or a banana = 1/4 + 1/2 = 3/4
To express this probability in percent form, multiply by 100:
3/4 * 100 = 75%
Therefore, the probability of selecting an apple or a banana is 75%.