Cherise has a bag of marbles for her little sister. it contains 10 orange marbles, 7 yellow marbles, and 3 green marbles. she drops the bag and 3 marbles roll out. what is the probability that all 3 marbles are yellow?

a. 343/8000

b. 21/800

c. 7/228

d. 3/20

the weights of rats in a city are normally distributed with a mean of 2.5 pounds and a standard deviation of 0.5 pounds.

about what percent of the rats in the city weigh between 2.0 pounds and 3.0 pounds?

a. 81.5%

b. 68%

c. 47.5%

d. 34%