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Probability
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1.   Justin lives in Montana. On a bus trip across the state he looks out the window and sees where other vehicles are from. On the trip he sees 125 vehicles with Montana plates and 40 with non-Montana plates. On the trip back the next day, what is the probability that the first car he sees is from Montana?

2.   Madison has taken twenty-two math quizzes this year. Of those, she scored above 90% on four of them and 80% or above on fourteen of them. What is the probability that she will score from 80% to 90% on her next math quiz?

3.   * This is a pre-made sheet.
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4.   The Ramirez family grew a large crop of sunflowers this year. As they were collecting the seeds and drying them, naturally they ate some to see how they tasted. In all they opened about two hundred seeds. Some of them they could not eat (about 15) because there was no embryo inside. In six cases they could not eat the seed because there was a worm inside. Assuming these results are typical for the entire crop, as they eat the seeds throughout the year, what is the probability that any particular seed chosen at random will be edible? State your answer as a percent rounded to the nearest tenth of a percent.

5.   Cameron has taken twenty-eight spelling quizzes this year. Of those, he scored below 70% on two of them. What is the probability that will score 70% or above on his next spelling quiz?

6.   Noah and Anthony go to the mall parking lot on weekends to see if they can find any loose change. People tend to lose small amounts of money in the parking lot. Over the past year they have kept track of how much money they have found. They found twenty-one quarters, three fifty-cent pieces, twenty-five dimes, thirty-five nickels, and one hundred ninety-seven pennies. What is the probability that the next coin they find will be worth more than ten cents? State your answer as a percent to the nearest percent.


 


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