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Probabilità
Matematica
Middle School Math
Algebra

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Name _____________________________
Date ___________________
Probabilità
Trova il numero di scelte possibili quando scegli un articolo da ciascuna categoria.
1.  7 flavors, 3 toppings


2.  4 vegetables, 2 desserts, 3 drinks


3.  14 hats, 8 scarves, 6 shirts, 10 pairs of pants



Trova la probabilità. Scrivi la tua risposta come una frazione nella forma più semplice.
1.  A jar contains 16 brown and 18 blue marbles. A marble is drawn at random.
P(blue).


2.  A number from 14 to 23 is drawn at random.
P(20 or 17).



Trova la probabilità. Scrivi la tua risposta come un decimale arrotondato al centesimo più vicino.
1.  A jar contains 18 purple and 12 brown marbles. A marble is drawn at random.
P(brown).


2.  A jar contains 19 green, 25 navy, 8 white, and 10 yellow marbles. A marble is drawn at random.
P(not green).



Trova la probabilità. Scrivi la tua risposta come una percentuale arrotondata alla percentuale intera più vicina.
1.  A jar contains 4 brown, 18 purple, 21 red, and 5 orange marbles. A marble is drawn at random.
P(purple).


2.  A jar contains 25 purple and 5 brown marbles. A marble is drawn at random.
P(not brown).



Key #2
Trova la probabilità.
1.  Fai rotolare un dado numerato da 1 a 6.
P(a number less than 1)
Esprimi la probabilità come una frazione.


2.  Fai rotolare un dado numerato da 1 a 6.
P(a number divisible by 2)
Esprimi la probabilità come un decimale. Arrotonda al centesimo più vicino.



Trova la probabilità. Assumi che la ruota sia separata in sezioni uguali.
1.  You roll a cube which has the numbers 8, 11, 12, 13, 15, e 18 on it. You then spin a spinner which has 6 sections. The letters on the spinner are H, D, A, B, G, e K.
P(12 and G)


2.  You roll a cube which has the numbers 1, 3, 12, 9, 9, e 12 on it. You then spin a spinner which has 3 sections. The letters on the spinner are H, K, e F.
P(9 and not F)



Trova la probabilità.
1.  A deck of cards has 2 green, 2 yellow, 4 white, and 6 blue cards. You pick 2 cards from the deck. Cards are not returned to the deck after they are picked.
P(the first card is yellow e the second card is blue)


2.  A deck of cards has 2 brown, 5 yellow, 6 navy, 3 pink, and 6 violet cards. You pick 2 cards from the deck. Cards are not returned to the deck after they are picked.
P(the first card is brown e the second card is violet)



Trova la probabilità. Assumi che la ruota sia separata in sezioni uguali.
1.  You roll a cube which has the numbers 15, 18, 21, 24, 26, e 27 on it. You then spin a spinner which has 5 sections. The letters on the spinner are J, G, F, D, e H.
P(21 and J)


2.  A deck of cards has 5 pink, 6 blue, and 4 black cards. You pick 2 cards from the deck. Cards are not returned to the deck after they are picked.
P(the first card is not blue e the second card is not blue)



Key #2
Completa.
1.  There are 3 things in a hat. How many ways can you pick 1 thing from the hat at once?


2.  There are 7 things in a hat. How many ways can you pick 5 things from the hat at once?



Completa.
1.  How many permutations can you make from the letters A through E?


2.  How many ways can a president and vice-president be selected in a class of ventuno students?



Completa.
1.  How many permutations can you make from the letters A through H?


2.  How many permutations can you make from the letters J, Q, Y, e S?



Completa.
1.  Qual è la probabilità che su due lanci consecutivi di un dado, esca prima un numero dispari, poi un numero pari?

2.  Jasmine rolls a die twice. What is the probability she will get a three both times?


Key #2
Completa.
1.  David found a snake in the yard a total of ten times (on different days) during last year. Assuming last year was a non-leap year, what is the probability David will find a snake in his yard on any particular day?

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 three hundred seeds. Some of them they could not eat (about10) because there was no embryo inside. In four 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.


Completa.
1.  What is the probability of choosing a heart from a standard deck of 52 randomly arranged playing cards?

2.  Beetles have hit the potato crop in Crumb County hard this year. On average about40% of the plants in the fields have been damaged by beetles. If you went to a local field of potatoes and randomly inspected one hundred five plants, about how many would you expect to find with beetle damage?


Completa.
1.  It is student council election time again! Your principle has asked you to vote for three representatives from your math class. Since your class is small (10students) it should not be too hard to figure out how many combinations of three students are possible to be selected in this process. Can you figure it out?

2.  If you have four books, how many different ways are there to stack these four books on a table?



Answer Key


Sample
This is only a sample worksheet.

Iscritti a edHelper - Crea un nuovo stampabile
La soluzione include anche le domande
La soluzione fornisce solo le risposte
Nessuna soluzione
Not a subscriber?  Sign up now for the subscriber materials!

Probabilità
Matematica
Middle School Math
Algebra

This worksheet still contains English.
edHelper is working on the translation