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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

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Good
Berger describes sociologists as concerned with
Mueller 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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