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Oksanka
9 days ago
6

The random variable KK has a geometric distribution with mean 16. Which of the following is closest to the standard deviation of

random variable KK ?
A. 0.0625
B. 0.9375
C. 4
D. 15.49
E. 240
Mathematics
1 answer:
Inessa [9K]9 days ago
5 0

Answer:

E 240

Step-by-step explanation:

Mean of the geometric distribution = (1- p) / p

16 = (1 - p) / p

16p = 1 - p;  17p = 1; thus, p = 1/17 = 0.058  

Standard Deviation = (1 - p) / p^2

= (1 - 0.058) / (0.058)^2

0.942 / 0.003364

= 280, which is closest to 240

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Geraldine has 200 feet of fencing. She wants to fence in a rectangular area. Which function A(w) represents the area of land tha
Zina [9171]
A(w) = -w² + 100w Step-by-step explanation: Initially, we need to express the length (l) of the rectangular area in terms of the width (w). Given that the total perimeter of the rectangle is 200 feet implies that 2(w + l) = 200, leading to l = 100 - w. Hence, the area A can be given as width multiplied by length: A = w * l = w * (100 - w) = -w² + 100w. Consequently, A(w) = -w² + 100w.
5 0
5 days ago
The table represents the equation y = 2 – 4x. A 2-column table with 5 rows. The first column is labeled x with entries negative
tester [8842]

The missing value associated with x=-1 is y=6

Explanation:

The provided equation for the table is y=2-4x

This table consists of 2 columns and 5 rows.

<pconsequently it="" states="">

x       y

-2      10

-1       ---

0        2

1        -2

2       -6

To find the value for y when x=-1

The value of y can be ascertained by substituting x=-1 into the equation y=2-4x

<pthus we="" determine="">

y=2-4(-1)

<pmultiplying the="" term="" within="" brackets="" yields="">

y=2+4

<psumming the="" terms="" we="" find="">

y=6

<pso the="">value of y when x=-1 is 6.

Hence, the value for x=-1 is y=6

</pso></psumming></pmultiplying></pthus></pconsequently>
7 0
25 days ago
Read 2 more answers
Ethan bought 4 packages of pencils. After he gave 8 pencils to his friends, he had 40 pencils left over. How many pencils were i
tester [8842]

Answer:

12 pencils per package.

Step-by-step explanation:

Details provided:

Ethan purchased 4 packages of pencils.

Number of Packages = 4

Number of pencils shared with friend = 8 pencils

Pencils remaining = 40 pencils

∴Total Number of Pencils = Pencils given to friend + Pencils remaining = 40+8 =48

Total Pencils in each package = \frac{\textrm{Total Number of Pencils}}{\textrm{No Of Packages}}= \frac{48}{4}= 12 \ pencils

8 0
26 days ago
The number of "destination weddings" has skyrocketed in recent years. For example, many couples are opting to have their wedding
zzz [9080]

Answer:

Based on the findings, we infer that the average cost of a wedding is lower than the $30,000 that was initially suggested.

Step-by-step explanation:

The following data set is provided: (in thousands)

29100, 28500, 28800, 29400, 29800, 29800, 30100, 30600

Formula:

\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}

where x_i denotes data points, \bar{x} represents the mean, and n indicates the number of samples.

Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}

Mean =\displaystyle\frac{236100}{8} = 29512.5

The sum of squares of the differences equals 3408750

S.D = \sqrt{\frac{3408750}{7}} = 697.82

The population mean, μ = $30,000

The sample mean, \bar{x} = $29512.5

Sample size, n = 8

Alpha, α = 0.05

Sample standard deviation, s = $697.82

Initially, we formulate the null hypothesis and the alternative hypothesis.

H_{0}: \mu = 30000\text{ dollars}\\H_A: \mu < 30000\text{ dollars} A one-tailed t-test will be conducted for this analysis.

Formula:

t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }

<pinserting the="" values="" we="" derive="">

t_{stat} = \displaystyle\frac{29512.5 - 30000}{\frac{697.82}{\sqrt{8}} } = -1.975

<pnow>

t_{critical} \text{ at 0.05 level of significance, 7 degree of freedom } = -1.894

<pgiven the="" situation="">

t_{stat} < t_{critical}

<pwe do="" not="" accept="" the="" null="" hypothesis="" and="" reject="" it.="">

Thus, we conclude that the average wedding cost is indeed less than the advertised $30,000.

</pwe></pgiven></pnow></pinserting>
8 0
21 day ago
The height of a triangular road sign is 1 inch shorter than twice its base. if the area of the sign is 60 in.2, which equation c
Inessa [9000]
Comment
Let's first tackle the simplest approach to finding the area of a triangle.

Formula for area is
A = 1/2 b * h

Substituting values
Area = 60 in^2
where b = x
and h = 2x - 1 
Thus, 60 = 1/2 * x * (2x - 1)

Now, we solve
60 = 1/2 * x (2x - 1) Multiply by 2
60 * 2 = x(2x - 1)
120 = x (2x - 1) Expand the brackets.
120 = 2x^2 - x  Subtract 120 from both sides.
2x^2 -  x - 120 = 0 which factors out to
(2x + 15)(x - 8) = 0

Now, solving for x
2x + 15 = 0
2x = - 15
thus, x = -15/2
which yields a negative value, hence discard this solution.

x - 8 = 0
gives us x = 8 

Area verification
base = 8
height = 16 - 1 = 15

thus Area = 1/2 * 8 * 15 = 60 confirming the calculation

Response
Utilize Area = 1/2 * b * h to determine both the base and height.
6 0
19 hours ago
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