When a polling company calls a telephone number at random, there is only a 9% chance that the call reaches a live person and the survey is successfully completed. Suppose the random digit dialing machine makes 15 calls. Let X = the number of calls that result in a completed survey.

(a) Calculate and interpret the mean of X.

(b) Calculate and interpret the standard deviation of X​

Answer:

x = -2  y= -8 and 8

Step-by-step explanation:

Since there is an equal number of y's, they cancel out when subtracting. You can put either equation on top. You will get same answer.

To find x:

If you do (3x - 2y = 10) - (5x + 2y = 6​), you will get -2x=4. Divide both sides by -2, and get x = -2.

If you do (5x + 2y = 6​) - (3x - 2y = 10), you will get 2x=-4.Divide both sides by 2, and get x = -2.

To find y:

Substitute -2 for x in either equation. It doesn't matter.

For 3(-2) - 2y = 10:

3(-2) - 2y = 10 ––Multiply

-6 - 2y =10 ––Add 6 to both sides to get y alone

-2y = 16 ––Divide by -2

y = -8

For 5x + 2y = 6​:

5(-2) + 2y = 6​ ––Multiply

-10 + 2y = 6 ––Add 10 to both sides to get y alone

2y = 16 ––Divide by 2

y = 8

Answer:

120m

Step-by-step explanation:

40% of x = 48

40/100*x= 48

x= 48*100/40

x = 120m

Answer:

Step-by-step explanation:

4x + 9y = -8

6x + 5y = 42

12x + 27y = -24

-12x - 10y = -84

17y = -108

y= -108/17

4x + 9(-108/17) = -8

4x - 972/17= -136/17

4x = 836/17

x = 209/17

y = -108/17

answer is no

Answer:

<yes

Step-by-step explanation:

Answer:

$660.19

Step-by-step explanation:

Hope this helps

Answer:

1660

Step-by-step explanation:

Answer:

14/15

Step-by-step explanation:

Answer:

I'm not very sure how I even got the answer, but the answer is 14/15

Answer:

Testing a new drug developed for treating degenerative joint disease (DJD) in dogs

The major reason for separate assignment for each breed of dog is that:

E) There must be an equal number of dogs in each of the two treatment groups.

Step-by-step explanation:

One of the two groups is the experimental group (treatment group).  It receives the new treatment whose effect the researchers are interested in finding out.  The other half (group) is called the control group.  It receives the traditional drug.  This control group (also called the comparison group) ensures that the treatment the researchers are giving to the dogs causes the expected experimental results.  This means that the results of the two groups are compared to determine the different effects.

Answer:

40

Step-by-step explanation:

Step-by-step explanation:

The small number above the 2 is called an exponent, and we use exponents to shorten a number so it's not so large. So here, the 6 is an exponent, and when we have a problem like this where we have to figure out something like 2^6, as shown above, we grab the base number, which in this case is 2, and we multiply it by itself 6 times, since 6 is the exponent. So basically you have to multiply the base number (2) by itself the same number of times as whatever the exponent is. So we have 2 × 2 × 2 × 2 × 2 ×2, and when you multiply all of this, you get 64. So the module has 64 pages.

Answer:

672

Step-by-step explanation:

I'm going to assume that this is a zero-coupon bond

simple interest is as follows

PV(1+it)

we have

1200(1+.07*8)

1200*1.56=1872

This is the accumulated value

to find the interest earned we use the following equation

AV-PV

we have

1872-1200=672

Answer:

3, ∞ hope this helps

Step-by-step explanation:

Answer:

y= 93/5x + 3

Step-by-step explanation:

Find the gradient-

m= [tex]\frac{96-3}{5-0}[/tex]= 93/5

Substitute into-

y-y1=m(x-x1)

y-3=93/5(x-0)

y= 93/5x + 3

Answer:

c) y = - 2 x +3

d)  y = 1/2  x + 1

Step-by-step explanation:

For c) Look for the exression that contains "3" as the y-intercept (the "b" in the form y = m x + b)

The only equation is y = - 2 x +3

For d) try in all equations if replacing x with 2, gives you an answer "2" for y as well.

The only equation that does such is   y = 1/2  x + 1

Answer:

It's 117

Step-by-step explanation:

The first team has a total of 515 and the second 398

so you subtract 398 from 515 and you will get 117

Scenario a: 4x+7=64

Scenario b: 4(7+x)=64

x represents how much the bags of rice weigh in each scenario.

Answer:

its a

Step-by-step explanation:

because as they said per hour is equally to 45 so the 2 hour will be 45 +45 which is 90 so its a

Answer:

Use a straightedge to connect consecutive points.

Step-by-step explanation:

C

Julie must draw a line joining the C to E, then E to D, D to F, and F to C, she will get a square into a circle.

It is defined as the combination of points that and every point has an equal distance from a fixed point ( called the center of a circle).

To construct a square into the circle A.

Let's assume the CD is the diameter of the circle.

By joining the point C and point D we will get a line CD(diameter of the circle)

Draw a line EF which Bisect the line CD.

Join point E and F which are on the circle and join them.

Draw a line joinig the point C to E, then E to D, then D to F, and F to C.

We will get a square inscribed into a circle.

Thus, Julie must draw a line joining the C to E, then E to D, D to F, and F to C, she will get a square into a circle.

Learn more about circle here:

brainly.com/question/11833983

Answer:

There is 8 cups.

Step-by-step explanation:

Hope this helps

Answer:

8 cups did you understand

Step-by-step explanation:

please follow me

Answer:

i think it would be 9cm for each piece

Step-by-step explanation:

i did 12 times 6 which was 72 then i divided by 8 and got 9 so i think that might be the answer.

Answer:

Step-by-step explanation:

4+n=15 subtract 4 from both sides

n=11

Unless the wording was incorrect this is an equation not an inequality.

Answer:

19 cause 15+4=is

Step-by-step explanation:

i made a 100%

Answer:

12 inches in a foot

36 inches in a yard

3 feet in a yard

5280 feet in a mile

1760 yards in a mile

Answer:

1 foot= 12 inches

1 yard= 3 feet

1 yard = 36 inches

1 mile= 5,280 feet

1 mile= 1,760 yards

Step-by-step explanation:

Just length conversion.

it should be in the correct order.

Answer:

A rule is a function if every number on the input side goes to exactly one number on the output side. A function is a rule where, if you know the input, you know what the output is going to be.

Step-by-step explanation:

i d k the answer so u sear che d it

but hope it helps

bye stay safe

god bless

and carry on learning

Answer:

angle C=88 degrees

Step-by-step explanation:

angles A+B+C+D=360

angles A+C=360-119-65=176

angle A=angle C because it is a kite

2C=176

angle C=88 degrees

Answer:

? = 1/3

Step-by-step explanation:

1 pound of grapes is worth 3 dollars.

Answer:

c-17=3

c=20

Step-by-step explanation:

what grade is this for?

hope this helps

Answer:

54°

Step-by-step explanation:

2x +2° = 3x - 52° { being vertically opposite angles }

3x - 2x = 52° + 2°

x = 54°

Hope it will help :)

Answer:

factors-----(a+2)(a^2+4-3a)