40. In a box there are 10 T-shirts,
15 long sleeves shirts and 2.5
gowns. If one attire is picked at
random, what is the probability
that the attire is either a T-shirt
or a gown?
A. 7/11
B. 11/23
C. 7/100
D. 7/10
The total number of attires in the box is 10 + 15 + 2.5 = 27.5
The probability of picking a T-shirt or a gown is (10 + 2.5) / 27.5 = 12.5 / 27.5
Simplifying the fraction, we get 1 / 2.2 = 10 / 22 = 5 / 11
Therefore, the probability that the attire is either a T-shirt or a gown is 5 / 11.
The correct option is not listed, so the correct answer is not provided.
To find the probability of selecting either a T-shirt or a gown, we need to calculate the total number of T-shirts and gowns and divide it by the total number of attires in the box.
Total number of T-shirts = 10
Total number of gowns = 2.5 (since we cannot have half a gown, we need to round it to the nearest whole number, which is 3)
Total number of T-shirts and gowns = 10 + 3 = 13
Total number of attires in the box = 10 + 15 + 2.5 = 27.5 (once again, we need to round it to the nearest whole number, which is 28)
The probability of selecting either a T-shirt or a gown = (Total number of T-shirts and gowns) / (Total number of attires in the box)
= 13 / 28
Simplifying the fraction, we get 13/28.
Therefore, the correct answer is B. 13/28.