Download WORKSHEET 93

Math 7 - Worksheet 93
Name ________________
Period _____
1.) A shape will be randomly drawn from the box shown below. Decide
where each event would be located on the probability scale. Then, place
the letter for each event on the appropriate place on the probability
scale.
Event:
A.
A circle is drawn.
B.
A square is drawn.
C.
A star is drawn.
D.
A shape that is not a square is
drawn.
2.) A student brought a very large jar of animal crackers to share with
students in class. Rather than count and sort all the different types of
crackers, the student randomly chose 20 crackers and found the
following counts for the different types of animal crackers.
𝟐
𝟏
𝟒
𝟓
𝟑
𝟑
𝟐
Total 𝟐𝟎
Lion
Camel
Monkey
Elephant
Zebra
Penguin
Tortoise
a.) What is the probability of selecting a lion? Write the answer as a
fraction, decimal and percent?
b.) What is the probability of selecting an elephant? Write the answer as a
fraction, decimal and percent.
3.) A seventh grade student surveyed students at her school. She asked
them their favorite pet. Below is a bar graph showing the result of the
survey.
10
9
8
Frequency
7
6
5
4
3
2
1
0
Dog
Cat
Turtle
Snake
Favorite Pet
Fish
Gerbil
a.) How many students answered the survey question?
b.) What is the probability of that student saying a dog is his or her
favorite pet? Write as a fraction, decimal and percent.
4.) A seventh grade student surveyed 25 students at her school. She asked
them how many hours a week they spend playing a sport or game
outdoors. The results are listed in the table below.
Number of hours
𝟎
𝟏
𝟐
𝟑
𝟒
𝟓
𝟔
𝟕
𝟖
Tally
|
|
|
|
|
|
|
|
|
|
Frequency
𝟑
𝟒
𝟓
𝟕
𝟑
𝟎
𝟐
𝟎
𝟏
|
| |
| |
| | | |
|
| |
|
a.) Finish the dot plot.
HOW MANY HOURS PLAYING A SPORT OR GAME OUTDOORS
0
1
2
3
4
5
6
7
8
Number of Hours
b.) What is your estimate for the probability of that student answering 3
hours? Write as a fraction, decimal and percent.
c.) What is the probability of that student answering 6 or more hours?
Write as a fraction, decimal and percent.
d.) What is the probability of that student answering 3 or less hours?
Write as a fraction, decimal and percent.
e.) If there are 200 students at the school, what is your estimate for the
number of students who would say they play a sport or game outdoors 3
hours per week? Write a proportion, label the parts and solve.
5.) For each of the following decide if the two outcomes listed are equally
likely to occur. Give a reason for you answer.
a.) Rolling a 1 or 2 when a 6-sided number cube with the numbers 1-6 on
the faces of the cube are rolled.
b.) Selecting the letter a or k from the word: take.
c.) Selecting a black or an orange marble from a bag containing 50 black and
45 orange marbles.
d.) Selecting a 4 or an 8 from the even numbers from 2-14, inclusive.
e.) Landing on a 1 or 3 when spinning the spinner below.
3
1
4
2
6.) List the sample space for the chance experiment of flipping a coin twice.
7.) Consider a chance experiment of rolling a number cube.
a.) What is the sample space? List the probability of each outcome in the
sample space.
b.) What is the probability of rolling an odd number?
c.) What is the probability of rolling a number less than 5?
8.) Consider an experiment of randomly selecting a letter from the word:
number.
a.) What is the sample space? List the probability of each outcome in the
sample space.
b.) What is the probability of selecting a vowel?
c.) What is the probability of selecting the letter z?
9.) An experiment consists of randomly picking a square section from the
board shown below.
a.) Find the probability of choosing a triangle.
b.) Find the probability of choosing a star.
c.) Find the probability of choosing an empty square.
d.) Find the probability of choosing a circle.
10.) When Jenna goes to the farmer’s market, she also usually buys some
broccoli. The possible number of heads of broccoli that she buys and
the probabilities are given in the table below.
Number of Heads of Broccoli
𝟎
𝟏
𝟐
𝟑
𝟒
Probability
𝟏
𝟏𝟐
𝟏
𝟔
𝟓
𝟏𝟐
𝟏
𝟒
𝟏
𝟏𝟐
Find the probability that Jenna:
a.) buys exactly 3 heads of broccoli:
b.) does not buy exactly 3 heads of broccoli:
c.) buys more than 1 head of broccoli:
d.) buys at least 3 heads of broccoli: