WorksheetsProbability Review
Total questions: 20
Worksheet time: 1hrs 11mins
You want to estimate the number of students in a high school who ride the school bus. Which sample is best?
4 students in the hallway
All students in the marching band
50 seniors at random
100 students at random during lunch
Manny wants to know how many students at CTMS enjoy solving math problems. What is the best sampling method?
ask for 20 volunteers to discuss whether they enjoy solving math problems
ask the last 20 people to arrive at CTMS
Ask every 20th student that walks into school
Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?
30 of her friends
30 randomly selected students in the school
30 students who are often tardy
30 students who are not often tardy
The mean is found by ___________________ all of the numbers and then _____________________ by the number of items.
adding, subtracting
adding, multiplying
dividing, adding
adding, dividing
$78, $79, $81, $82, $83
Two days later, another store has the same shoes on sale for $65. How does the new price affect the data?
What is the RANGE of her test scores?
A team of 10 basketball players have their heights recorded to make a data set The mean,
median, mode, and range of the data set are recorded Then, the height of the team’s coach is
included to make a new data set The coach is shorter than all but one of the basketball players
Which measure must be the same when the coach’s height is included?
mean
median
mode
range
Which statement best describes a random sample of all students in a middle school?
Of all the students who are on the track team, the first three to finish a race
are selected
Of all the students who are in the drama club, every third student on the roster
is selected.
Of all the students who complete an assignment, the first, third, and tenth students
are selected.
Of all the students who attend a school-wide assembly, those sitting in every third seat
are selected.
A bag contains 15 yellow cubes, 6 blue cubes, and 4 red cubes. If you select a cube at random, what is the probability the cube will NOT be yellow?
25/15
2/5
15
5/3
What is the probability of rolling a 3 and spinning a red?
1/6
1/4
1/10
1/24
George is conducting a survey to determine if corn dogs should be sold in the school cafeteria. Which sampling method will give him the best results?
Interview randomly selected vegetarian students
interview randomly selected students at waffle house
interview randomly selected students who bring a lunch box
interview randomly selected students who eat lunch in the cafeteria
If a spinner is spun once, what is the probability it will land on "X"?
53
51
73
83
The probability of an event is 6/8. Which word best describes the probability?
certain
impossible
likely
unlikely
What is the probability you will choose either a black or white marble?
