# 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

#### Questions & Answers

I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
what is the stm
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?
what is a peer
What is meant by 'nano scale'?
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
what is Nano technology ?
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?
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
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
how did you get the value of 2000N.What calculations are needed to arrive at it
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