Using Proportions
A science teacher chose a girl to pass out tests to the class. If there are 35 students in the class and the probability of choosing a girl is 4/7, how many girls are in the class?
20
Tara has a spinner with four different sections on it, two blue and two green. What are the complementary probabilities for this event?
1/2 and 1/2
What is the sample space for an eight-sided die
(1,2,3,4,5,6,7,8)
Write an equation and solve:
The probability of getting a four on a six-sided die
P(4)=1/6
What is the probability of an experiment if the outcomes are equally likely
1/2
If I roll two fair die 144 times, predict how many times I will roll a sum less than 5.
24
Bob rolls a fair die and flips a fair coin, what is the probability he will land on an even number and heads?
What is 6/12 or 1/2?
Label the uniform and non-uniform probability models
a. Randomly choose a sock from a drawer that contains 4 black socks, 2 brown socks, and 2 blue socks
b. Randomly select a day of the week to give your dog a bath by writing each day of the week on a slip of paper and choosing a slip of paper from a bag
a. non-uniform
b. uniform
There is a bag with tiles that are numbered 1-37. What is the probability of getting a tile that is not odd?
P(not odd)= 18/37
List the outcomes that make up the event of rolling a number greater than 4. Then calculate the probability.
5 and 6
P(greater than 4)=1/3
At Frank's Furniture Store, the ratio of sales of living room furniture to bedroom furniture sets is 3 to 2. If 134 bedroom sets were sold last year, what is the best prediction for the number of living room sets sold last year?
201
Luis has a bag of 2 blue marbles, 5 yellow marbles, and 4 yellow marbles. What are the complementary probabilities for this event?
2/11 5/11 4/11
In a bag of 20 marbles colored black, red, blue, and yellow, 80% of the marbles are black, red, or blue. How many marbles yellow? (not the percent)
4
Write an equation and solve:
If the weather report calls for a 20% chance of rain, what is the probability it will not rain?
P(not rain) = 80%
Suppose Joe rolls a 6 sided number cube. If the probability of rolling a number less than 5 is 2/3, what is the best prediction of the number of times Joe will roll less than 5 if he rolls the cube 150 times?
100
David wants to win a bear at a carnival game that has 3 prizes. He knows he has a 1/9 chance of getting a frog, and a 3/12 chance of getting a pig. What are his chances of winning a bear?
13/36
Randall spins a spinner evenly divided into four sections numbered 1,2,3, and 4. If he spins it twice, what is the probability of getting a sum that is greater than 4?
3/4
Write an equation and solve(%):
There is a .3 chance of rain on Monday and .5 chance of rain on Tuesday. What is the probability it will rain on Monday and Tuesday?
P(rain M and T)= 15%
Members of the art club are painting a wall in the lunchroom. They are making a design with 3 rows of stripes. The first row has 6 inch stripes, the second row has 8 inch stripes, and the third row has 12 inch stripes. At what length will the lines meet?
24
Sarah's recipe asks for equal parts of butter and sugar, 2 cups of flour, and 1/3 the amount of butter worth of chocolate chips. If we know that there is twice as much flour as sugar, how many cups of chocolate chips does she need for 36 cups of flour?
6 cups of chocolate chips
In a bag containing 30 marbles: 5 of the marbles are red, 2 are green, half of the marbles are orange, and the rest of the marbles are pink. What are the complementary probabilities for this event?
1/6 1/15 1/2 4/15
Which sample is not a good survey? A) favorite flower asked at a mall, B)favorite hobby asked at a model train store, C)favorite holiday at a fast-food restaurant, or D)favorite sport asked at a library
What is B) favorite hobby asked at a model train store?
Write out the formula for probability as a fraction and label the numerator and the denominator
P= possible outcomes/total number of outcomes
What kind of events are events that together contain all of the outcomes in the sample space?
Complementary Events