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La probabilité
Mathématiques
Middle School Math
L'algèbre

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 Name _____________________________ Date ___________________
La probabilité
Complète.

 1 Mackenzie, Nicole, and Hunter are running for class president. Jacob surveyed forty-one students. Twenty-one students plan to vote for Mackenzie, ten plan to vote for Nicole, three students do not plan to vote, and the rest of the students she surveyed plan to vote for Hunter. What is the probability that the next student surveyed plans to vote for Hunter?
 2 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 four hundred seeds. Some of them they could not eat (about25) because there was no embryo inside. In ten 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.
 3 Morgan has taken thirty-two math quizzes this year. Of those, she scored above 90% on five of them and 80% or above on eleven of them. What is the probability that she will score from 80% to 90% on her next math quiz?
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 5 Christian 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 sees200vehicles with Montana plates and20with non-Montana plates. On the trip back the next day, what is the probability that the first car he sees is from Montana?
 6 Daniel bought a die at the magic shop. He rolls it 152 times and gets the following results. A 1 thirty-three times, a 2 twenty-nine times, a 3 fifteen times, a 4 seventeen times, a 5 thirty-two times and a 6 twenty-six times. What is the probability he will get a 6 on the next roll?

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