# 4.9 Homework  (Page 6/7)

 Page 6 / 7

Refer to the above problem. Suppose you randomly survey 11 California residents. We are interested in the number who have adequate earthquake supplies.

• What is the probability that at least 8 have adequate earthquake supplies?
• Is it more likely that none or that all of the residents surveyed will have adequate earthquake supplies? Why?
• How many residents do you expect will have adequate earthquake supplies?
• 0.0043
• none
• 3.3

The next 2 questions refer to the following: In one of its Spring catalogs, L.L. Bean® advertised footwear on 29 of its 192 catalog pages.

Suppose we randomly survey 20 pages. We are interested in the number of pages that advertise footwear. Each page may be picked at most once.

• How many pages do you expect to advertise footwear on them?
• Is it probable that all 20 will advertise footwear on them? Why or why not?
• What is the probability that less than 10 will advertise footwear on them?

Suppose we randomly survey 20 pages. We are interested in the number of pages that advertise footwear. This time, each page may be picked more than once.

• How many pages do you expect to advertise footwear on them?
• Is it probable that all 20 will advertise footwear on them? Why or why not?
• What is the probability that less than 10 will advertise footwear on them?
• Reminder: A page may be picked more than once. We are interested in the number of pages that we must randomly survey until we find one that has footwear advertised on it. Define the random variable X and give its distribution.
• What is the probability that you only need to survey at most 3 pages in order to find one that advertises footwear on it?
• How many pages do you expect to need to survey in order to find one that advertises footwear?

• 3.02
• No
• 0.9997
• 0.3881
• 6.6207 pages

Suppose that you roll a fair die until each face has appeared at least once. It does not matter in what order the numbers appear. Find the expected number of rolls you must make until each face has appeared at least once.

## Try these multiple choice problems.

For the next three problems : The probability that the San Jose Sharks will win any given game is 0.3694 based on a 13 year win history of 382 wins out of 1034 games played (as of a certain date). An upcoming monthly schedule contains 12 games.
Let $X$ = the number of games won in that upcoming month.

The expected number of wins for that upcoming month is:

• 1.67
• 12
• $\frac{382}{1043}$
• 4.43

D: 4.43

What is the probability that the San Jose Sharks win 6 games in that upcoming month?

• 0.1476
• 0.2336
• 0.7664
• 0.8903

A: 0.1476

What is the probability that the San Jose Sharks win at least 5 games in that upcoming month

• 0.3694
• 0.5266
• 0.4734
• 0.2305

C: 0.4734

For the next two questions : The average number of times per week that Mrs. Plum’s cats wake her up at night because they want to play is 10. We are interested in the number of times her cats wake her up each week.

In words, the random variable $X$ =

• The number of times Mrs. Plum’s cats wake her up each week
• The number of times Mrs. Plum’s cats wake her up each hour
• The number of times Mrs. Plum’s cats wake her up each night
• The number of times Mrs. Plum’s cats wake her up

A: The number of times Mrs. Plum's cats wake her up each week

Is there any normative that regulates the use of silver nanoparticles?
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
why we need to study biomolecules, molecular biology in nanotechnology?
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
why?
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
what does nano mean?
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
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
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
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 ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
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
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