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3 years ago

How many trapezoids can you find in this grid of 12-points

Mathematics

1 answer:

netineya [11]3 years ago

6 0

Answer:

Can I see the graph?

Step-by-step explanation:

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A random sample of 25 glass sheets is obtained and their thicknesses are measured. The sample mean is x= 3.54 mm and sample stan

lisabon 2012 [21]

Answer: (3.46, 3.62)

Step-by-step explanation:

The formula to find the confidence interval for population mean is given :-

$\overline{x}\ \pm\ t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

, where n = sample size.

$t_{\alpha/2}$ = Two-tailed t-value for significance level of $(\alpha)$ and degree of freedom df= n-1.

$s$ = sample standard deviation.

As per given , we have

$\overline{x}= 3.54$ mm

s= 0.20 mm

n= 25

Significance level $=\alpha=1-0.95=0.05$

Since population standard deviation is not given , it means the given problem has t- distribution.

Two-tailed t-value for significance level of $(0.05)$ and degree of freedom df= 24:

$t_{\alpha/2\ ,df}=t_{0.025,\ 24}=2.0639$

95% Confidence interval for population mean:

$3.54\ \pm\ (2.0639)\dfrac{0.20}{\sqrt{25}}$

$=3.54\ \pm\ (2.0639)\dfrac{0.20}{5}$

$=3.54\ \pm\ (2.0639)(0.04)$

$=3.54\ \pm\ 0.082556$

$=(3.54- 0.082556,\ 3.54+ 0.082556 )=(3.457444,\ 3.622556)\approx(3.46,\ 3.62)$

Hence, the 95% two-sided confidence interval for the mean glass thickness = (3.46, 3.62)

7 0

3 years ago

Does anyone understand this? It’s supposed to be a 2 digit code

nordsb [41]

Code: 54
4+5+2+9+10+4+3+5+1+11

5 0

3 years ago

Three students are arguing over who can run the fastest. Student A says that she can run mile in six minutes. Student B says tha

Elodia [21]

Student B would be able to run 1/4 of a mile in one minute.

5 0

3 years ago

I have another question: I need to solve this problem - 3(7x-2) = 5(4x+5)-23

kodGreya [7K]

-3(7x-2) = 5(4x+5)-23

-21x + 6 = 20x + 25 - 23

-21x + 6 = 20x + 2

4 = 41x

x = 4/41 = 0.0976

7 0

3 years ago

Read 2 more answers

Tickets to a local movie theater were sold at $6.00 for adults and $4.50 for students. There were 240 tickets sold for a total o

andreev551 [17]

Answer: State that y = 430-x, and substitute it into the second equation 6x +4.5(430-x)= 2175.

Solve for x. Then plug in what you get for x into the x+y=430 equation and solve for y. Your number of adult tickets should equal 160, and your number of child tickets should equal 270.

Step-by-step explanation:

6 0

3 years ago