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Practice set e
A study of the air quality in a particular city by an environmental group suggests that
years from now the level of carbon monoxide, in parts per million, in the air will be
(a) What is the level, in parts per million, now?
(b) How many years from now will the level of carbon monoxide be at 8 parts per million? Round to the nearest tenth.
(a).
parts per million (b).
years
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Sample set f
A contractor is to pour a concrete walkway around a swimming pool that is 20 feet wide and 40 feet long. The area of the walkway is to be 544 square feet. If the walkway is to be of uniform width, how wide should the contractor make it?
Step 1: Let
= the width of the walkway.
Step 2: A diagram will help us to get the equation.
(Area of pool and walkway) — (area of pool) = (area of walkway)
Check a width of 4 feet as a solution.
Area of pool = (20)(40) = 800
Area of walkway =
This solution checks.
Step 5: The contractor should make the walkway 4 feet wide.
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Practice set f
A contractor is to pour a concrete walkway around a swimming pooi that is 15 feet wide and 25 feet long. The area of the walkway is to be 276 square feet. If the walkway is to be of uniform width, how wide should the contractor make it?
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Exercises
Some of the following problems have actual applications and some are intended only as logic developers. A calculator may be helpful. The problems appear in groups and correspond to the noted Sample Set problem.
Sample set a—type problems
The manufacturer of electronic fuel injectors determines that the number
of injectors sold is related to the price
per injector by
At what price should the manufacturer price the injectors so that 112 of them are sold?
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The owner of a stained-glass shop determines that the number
of pieces of a particular type of glass sold in a month is related to the price
per piece by
At what price should the shop buyer price the glass so that 162 sell?
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It is estimated that
years from now the population of a certain city will be
(a) What is the population now?
(b) How many years from now will the population be 12,000?
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It is estimated that
years from now the population of a certain city will be
(a) What is the population now?
(b) How many years from now will the population be 24,000?
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If an object is thrown vertically upward, its height
, above the ground, in feet, after
seconds is given by
, where
is the initial height from which the object is thrown and
is the initial velocity of the object. Using this formula and an approach like that of Sample Set A, solve this problem.
A ball thrown vertically into the air has the equation of motion
(a) How high is the ball at
(the initial height of the ball)?
(b) How high is the ball at
(after 1 second in the air)?
(c) When does the ball hit the ground? (
Hint: Determine the appropriate value for
then solve for
.)
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Questions & Answers
number of sport play by 50 student construct discrete data
width of the frangebany leaves on how to write a introduction
Solve the mean of variance
Step 1: Find the mean. To find the mean, add up all the scores, then divide them by the number of scores. ...
Step 2: Find each score's deviation from the mean. ...
Step 3: Square each deviation from the mean. ...
Step 4: Find the sum of squares. ...
Step 5: Divide the sum of squares by n – 1 or N.
kenneth
Is mistake done to something
Vutshila
What is the life teble
anas
statistics is the analyzing of data
how do you calculate mean
diveving the sum if all values
Shaynaynay
let A1,A2 and A3 events be independent,show that (A1)^c, (A2)^c and (A3)^c are independent?
data collected all over the world
Shaynaynay
construct a less than and more than table
The sample of 16 students is taken. The average age in the sample was 22 years with astandard deviation of 6 years. Construct a 95% confidence interval for the age of the population.
Bhartdarshan' is an internet-based travel agency wherein customer can see videos of the cities they plant to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400
a. what is the probability of getting more than 12,000 hits?
b. what is the probability of getting fewer than 9,000 hits?
Bhartdarshan'is an internet-based travel agency wherein customer can see videos of the cities they plan to visit. The number of hits daily is a normally distributed random variable with a mean of 10,000 and a standard deviation of 2,400.
a. What is the probability of getting more than 12,000 hits
Akshay
Sorry i want to learn more about this question
Bright
a= 0.20233
b=0.3384
Sufiyan
How do I interpret level of significance?
It depends on your business problem or in Machine Learning you could use ROC- AUC cruve to decide the threshold value
Shivam
how skewness and kurtosis are used in statistics
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Source:
OpenStax, Elementary algebra. OpenStax CNX. May 08, 2009 Download for free at http://cnx.org/content/col10614/1.3
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