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%
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