# 1.1 Skills practice exam 2: chapters 3, 4, 5, & 6  (Page 3/3)

Suppose that one De Anza College employee is randomly selected.

Find P (the employee is an Administrator)

• 278/34
• 304/616
• 34/616
• 80/616

C

Find P (the employee is Faculty AND American Indian)

• 382/616
• 3/616
• 3/4
• 3/278

B

Find P (employee is Staff OR Hispanic)

• 384/616
• 80/616
• 304/616
• 354/616

D

Find P (employee is an Administrator GIVEN the employee is Black)

• 40/616
• 5/34
• 5/616
• 5/40

D

Being an Administrator and an American Indian are

• mutually exclusive events
• independent events
• mutually exclusive and independent events
• neither mutually exclusive nor independent events

A

P(X\$gt; 4 or X<2) is best described by which of the following graphs?

B

Questions 29 - 32 refer to the following: When a customer calls the "Help Line" at ABC Computer Software Co., the amount of time that a customer must wait "on hold" until somebody answers the line and helps the customer follows an exponential distribution with mean of 7.5 minutes.

What is the probability that a customer waits more than 10 minutes to receive help?

• 0.2636
• 0.75
• 0.7364
• 0

A

What is the 40th percentile of wait times for customers calling the help line?

• 6.87 minutes
• 3.83 minutes
• 0.68 minutes
• 0.122 minutes

B

The customer wait time that is 1 standard deviation above the mean is:

• 2.17 minutes
• 7.5 minutes
• 9.67 minutes
• 15 minutes

D

The probability that a customer calling the help line waits exactly 6 minutes for help:

• 0
• 0.45
• 0.55
• 0.8

A

Questions 33 – 35 refer to the following: ABC Delivery Service offers next day delivery of packages weighing between 2 and 20 pounds in a certain city. The have found that the weights of the packages they deliver are uniformly distributed between 2 and 20 pounds.

What is the probability that a package weighs between 10 and 15 pounds?

• 0.2778
• 0.5556
• 0.2500
• 0.8333

A

Given that a package weighs less than 10 pounds, what is the probability that it weighs less than 5 pounds?

• 0.1667
• 0.6250
• 0.3750
• 0.5000

C

35% of packages weigh less than how many pounds?

• 7.8 pounds
• 8.3 pounds
• 11.7 pounds
• 13.7 pounds

B

Suppose that the probability that an adult in California will watch a Giant’s World Series game is 65%. Each person is considered independent. Of interest, is the number of adults in California we must survey until we find one who will watch a Giant’s World Series game. What is the probability that you must ask 2 or 3 people? (This is a geometric problem. If you did not cover the geometric distribution, then skip this problem.)

• 0.6500
• 0.3071
• 0.2275
• 0.0796

B

Questions 37– 39 refer to the following: The amount of time De Anza students work per week is approximately normally distributed with mean of 18.17 hours and a standard deviation of 12.92 hours.

The median is:

• Not enough information
• 12.92
• 2.0
• 18.17

D

The 90th percentile for the amount of time De Anza students work per week is:

• 1.61
• 18.17
• 90
• 34.7

D

Which of the following is NOT TRUE about the normal distribution?

• the mean, median and mode are equal
• the curve is skewed to the right
• the curve never touches the x-axis
• the area under the curve is one.

B

We use the z-score to:

• compare normal distributions with different averages and standard deviations
• drive statistics students nuts
• compare exponential distributions with the same average
• compare uniform distributions with different minimum and maximum numbers

A

how do they get the third part x = (32)5/4
can someone help me with some logarithmic and exponential equations.
20/(×-6^2)
Salomon
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
Salomon
I'm not sure why it wrote it the other way
Salomon
I got X =-6
Salomon
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
Commplementary angles
hello
Sherica
im all ears I need to learn
Sherica
right! what he said ⤴⤴⤴
Tamia
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
a perfect square v²+2v+_
kkk nice
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
or infinite solutions?
Kim
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Al
y=10×
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
rolling four fair dice and getting an even number an all four dice
Kristine 2*2*2=8
Differences Between Laspeyres and Paasche Indices
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
is it 3×y ?
J, combine like terms 7x-4y
how do you translate this in Algebraic Expressions
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
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
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
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
can nanotechnology change the direction of the face of the world
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
how did you get the value of 2000N.What calculations are needed to arrive at it
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