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Michaela is in charge of 6 two-year olds at a daycare center. Their ages, in months, are 25 , 24 , 28 , 32 , 29 , and 31 . Find the median age.

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Brian is teaching a swim class for 6 three-year olds. Their ages, in months, are 38 , 41 , 45 , 36 , 40 , and 42 . Find the median age.

40.5 months

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Sal recorded the amount he spent for gas each week for the past 8 weeks. The amounts were $38.65 , $32.18 , $40.23 , $51.50 , $43.68 , $30.96 , $41.37 , and $44.72 . Find the median amount.

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Identify the Mode of a Set of Numbers

In the following exercises, identify the mode.

2 , 5 , 1 , 5 , 2 , 1 , 2 , 3 , 2 , 3 , 1

2

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8 , 5 , 1 , 3 , 7 , 1 , 1 , 7 , 1 , 8 , 7

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18 , 22 , 17 , 20 , 19 , 20 , 22 , 19 , 29 , 18 , 23 , 25 , 22 , 24 , 23 , 22 , 18 , 20 , 22 , 20

22

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42 , 28 , 32 , 35 , 24 , 32 , 48 , 32 , 32 , 24 , 35 , 28 , 30 , 35 , 45 , 32 , 28 , 32 , 42 , 42 , 30

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The number of children per house on one block: 1 , 4 , 2 , 3 , 3 , 2 , 6 , 2 , 4 , 2 , 0 , 3 , 0 .

2 children

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The number of movies watched each month last year: 2 , 0 , 3 , 0 , 0 , 8 , 6 , 5 , 0 , 1 , 2 , 3 .

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The number of units being taken by students in one class: 12 , 5 , 11 , 10 , 10 , 11 , 5 , 11 , 11 , 11 , 10 , 12 .

11 units

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The number of hours of sleep per night for the past two weeks: 8 , 5 , 7 , 8 , 8 , 6 , 6 , 6 , 6 , 9 , 7 , 8 , 8 , 8 .

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Use the Basic Definition of Probability

In the following exercises, express the probability as both a fraction and a decimal. (Round to three decimal places, if necessary.)

Josue is in a book club with 20 members. One member is chosen at random each month to select the next month’s book. Find the probability that Josue will be chosen next month.

1 20 , 0.05

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Jessica is one of eight kindergarten teachers at Mandela Elementary School. One of the kindergarten teachers will be selected at random to attend a summer workshop. Find the probability that Jessica will be selected.

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There are 24 people who work in Dane’s department. Next week, one person will be selected at random to bring in doughnuts. Find the probability that Dane will be selected. Round your answer to the nearest thousandth.

1 24 , 0.041 6 0.042

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Monica has two strawberry yogurts and six banana yogurts in her refrigerator. She will choose one yogurt at random to take to work. Find the probability Monica will choose a strawberry yogurt.

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Michel has four rock CDs and six country CDs in his car. He will pick one CD to play on his way to work. Find the probability Michel will pick a rock CD.

4 10 , 0.4

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Noah is planning his summer camping trip. He can’t decide among six campgrounds at the beach and twelve campgrounds in the mountains, so he will choose one campground at random. Find the probability that Noah will choose a campground at the beach.

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Donovan is considering transferring to a 4-year college . He is considering 10 out-of state colleges and 4 colleges in his state. He will choose one college at random to visit during spring break. Find the probability that Donovan will choose an out-of-state college.

10 14 , 0 . 714285 ——— 0.714

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There are 258,890,850 number combinations possible in the Mega Millions lottery. One winning jackpot ticket will be chosen at random. Brent chooses his favorite number combination and buys one ticket. Find the probability Brent will win the jackpot. Round the decimal to the first digit that is not zero, then write the name of the decimal.

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Everyday math

Joaquin gets paid every Friday. His paychecks for the past 8 Fridays were $315 , $236.25 , $236.25 , $236.25 $315 , $315 , $236.25 , $393.75 . Find the mean, median, and mode.

  1. $285.47
  2. $275.63
  3. $236.25

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The cash register receipts each day last week at a coffee shop were $1,845 , $1,520 , $1,438 , $1,682 , $1,850 , $2,721 , $2,539 . Find the mean, median, and mode.

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Writing exercises

Explain in your own words the difference between the mean, median, and mode of a set of numbers.

Answers will vary.

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Make an example of probability that relates to your life. Write your answer as a fraction and explain what the numerator and denominator represent.

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

.

After looking at the checklist, do you think you are well prepared for the next section? Why or why not?

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
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A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
Shanjida
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
s.
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
Practice Key Terms 3

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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