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Andreas93 [3]
3 years ago
13

A farmer has a square plot of land he needs to fence. he walked the diagonal of the plot of land and found it to be 80 yards. ho

w much fencing will he need to fence the plot of land?
Mathematics
1 answer:
gladu [14]3 years ago
6 0

Answer:

Step-by-step explanation:

Since it is a square and we know the hypotenuse squared is equal to the sum of its squared sides

d^2=2s^2, we are told d=80 so

2s^2=80^2

s^2=3200

s=3200^(1/2)

P=4s

P=4(3200^(1/2))

P=160(2^(1/2) yds or approximately

P=226.27 yds

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Two sisters, sister A and sister B, play SCRABBLE with each other every evening. Sister A is a statistician, and she draws a ran
snow_tiger [21]

Answer:

First question: LCL = 522, UCL = 1000.5

Second question: A sample size no smaller than 418 is needed.

Step-by-step explanation:

First question:

Lower bound:

0.36 of 1450. So

0.36*1450 = 522

Upper bound:

0.69 of 1450. So

0.69*1450 = 1000.5

LCL = 522, UCL = 1000.5

Second question:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

The project manager believes that p will turn out to be approximately 0.11.

This means that \pi = 0.11

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The project manager wants to estimate the proportion to within 0.03

This means that the sample size needed is given by n, and n is found when M = 0.03. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.03 = 1.96\sqrt{\frac{0.11*0.89}{n}}

0.03\sqrt{n} = 1.96\sqrt{0.11*0.89}

\sqrt{n} = \frac{1.96\sqrt{0.11*0.89}}{0.03}

(\sqrt{n})^2 = (\frac{1.96\sqrt{0.11*0.89}}{0.03})^2

n = 417.9

Rounding up

A sample size no smaller than 418 is needed.

6 0
3 years ago
I hope u can help meeeee!!!​
lubasha [3.4K]
That’s some Jesus math there buddy idek
3 0
3 years ago
Picture shown help! !!
ankoles [38]
C is the answer to this question
7 0
3 years ago
Which line has an equation of y = negative 5 x + 4 in slope-intercept form? a line passing through the points (1, 9) and (3, 19)
skelet666 [1.2K]

Answer:

(2,-6) and (4,-16)

Step-by-step explanation:

-5x+4 crosses these points

5 0
3 years ago
Read 2 more answers
(picture) Factoring Polynomials: GCF PLEASEE HELP!!!!!<br> a<br> b<br> c<br> d
tigry1 [53]

Answer:

greatest common factor is 2

Step-by-step explanation:

4k, 18k^4, 12

To find greatest common factor , we write each term in factor form

factors form are the product of the factor of given term

4k ---> 2 * 2* k

18k^2 ----> 3 * 3* 2* k*k

12 -----> 2*2*3

all the three terms has common factor 2

So GCf is 2


6 0
3 years ago
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