WorksheetsMM5
Total questions: 20
Worksheet time: 40mins
Each student in a class of 38 students was asked to report how many siblings (brothers and sisters) he has. The data are summarized in the table below. Based on the data, estimate the probability that a randomly selected student from this class is an only child.
8/38
13/38
12/38
3/38
1/38
Based on the data, estimate the probability that a randomly selected student from this class has three or more siblings.
3/38
4/38
5/38
6/38
7/38
A cell phone company wants to predict the probability of a seventh grader in your city, City A, owning a cell phone. Records from another city, City B, indicate that 201 of 1,000 seventh graders own a cell phone. Assuming the probability of a seventh grader owning a cell phone is similar for the two cities, estimate the probability that a randomly selected seventh grader from City A owns a cell phone.
(a)
The company estimates the probability that a randomly selected seventh-grade male owns a cell phone is 0.25. Does this imply that the probability that a randomly selected seventh-grade female owns a cell phone is 0.75?
yes
no
In the game of darts, players throw darts at a circle divided into 20 wedges. In one variation of the game, the score for a throw is equal to the wedge number that the dart hits. So, if the dart hits anywhere in the 20 wedge, you earn 20 points for that throw. If you are equally likely to land in any wedge, what is the probability you will score 20 points?
(a)
If you are equally likely to land in any wedge, what is the probability you will land in the upper right and score 20, 1, 18, 4, 13, or 6 points?
(a)
What is the probability your next throw lands on 6?
(a)
What is the probability your next throw doesn't land on 6?
(a)
What number has the greatest probability?
(a)
You and a friend decide to conduct a survey at your school to see whether students are in favor of a new dress code policy. Your friend stands at the school entrance and asks the opinions of the first 100 students who come to campus on Monday. You obtain a list of all the students at the school and randomly select 60 to survey. Which do you believe is more likely to be representative of the school population?
Your friend
You
A student purchases a bag of “mini” chocolate chip cookies and, after opening the bag, finds one cookie that does not contain any chocolate chips! The student then wonders how unlikely it is to randomly find a cookie with no chocolate chips for this brand. Based on the bag of 30 cookies, estimate the probability of this company producing a cookie with no chocolate chips.
(a)
Yousef intends to buy a car. He wishes to estimate the mean fuel efficiency (in miles per gallon) of all cars available at this time. Yousef selects a random sample of 10 cars and looks up their fuel efficiencies on the Internet. What is the mean of the 10 cars?
(a)
The mathematical average.
Mean
Median
Mode
Range
Largest value minus the smallest value.
Mean
Median
Mode
Range
The value that appears the most often.
mean
median
mode
range
The value in the center of the data listed in numerical order.
mean
median
mode
range
