Question

D. a set of cards has 25 cards with stars, 15 cards with squares, and 10 cards with circles. find the probability of each event when a card is chosen at random. a. square b. cicle c. star or circle d. not a circle or square

Answer 1

a. 3/10 b. 1/5 c. 7/10 d. 1/2

Explanation:

a. Probabily of a square being chosen is 3/10
b. Probabily of a circle being chosen is 1/5
c. Probabily of a star or circle being chosen is 7/10
d. Probabily of a circle or square not being chosen is 1/2

Answer 2

look below

Explanation:

The probability of each of the cards can be found by dividing each of them by the sum of all the numbers:

P of picking card with star:

25/50=0.5

Card with square:

15/50=3/10=0.3

Card with circle: 10/50=1/5=0.2

We can then put these values into parts a,b,c, and d:

a) 3/10 chance or 30%

b) 1/5 chance or 20%

c) 1/2+1/5=7/10 chance or 70%

d) 1-0.3-0.2=1/2 chance or 50%