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4 years ago

Helppppppppppppp pliss

Mathematics

1 answer:

Aliun [14]4 years ago

4 0

The straight line equals 180
The two angels have to equal 180

180-63=117

117-25=92

92 divided by 4 is 23

x=23

I hope this helped!

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The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the

Darya [45]

Answer:

Brand 1 Brand 2 Difference

37734 35202 2532

45299 41635 3664

36240 35500 740

32100 31950 150

37210 38015 −805

48360 47800 560

38200 37810 390

33500 33215 285

Sum of difference = 2532+ 3664+740+150 −805+ 560 +390 +285 = 7516

Mean = $d=\frac{7516}{8}$

Mean = $d=939.5$

a) d= 939.5

$\text{Sample Standard deviation, s} = \sqrt{\dfrac{(x-\bar{x})^2}{n-1}}$

$=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}$

=1441.21

b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

confidence level =99%

significance level =α= 0.01

Degree of freedom = n-1 = 8-1 =7

So, $t_{\frac{\alpha}{2}}=3.499$

Formula for confidence interval $= \left( \bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}} \right)$

Substitute the values

confidence interval $= 939.5 \pm 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

confidence interval $= 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$ to $= 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

Confidence interval $−843.396\$ to $2722.396$

8 0

3 years ago

Solve the inequality. Graph the solution set and write it in interval notation. .

STALIN [3.7K]

Answer:

-4

Step-by-step explanation:

8 0

3 years ago

Five more than three times a number is 197. find the mlnumber

insens350 [35]

Answer:

Step-by-step explanation:

If the number is x we have the equation:-

3x + 5 = 197

Subtract 5 from both sides:-

3x = 192

x = 192/3

x = 64

7 0

3 years ago

Brian invests £8300 into his bank account.

vekshin1

Answer:

£9,148.37 pounds

Step-by-step explanation:

you need to get the 1.4% of 8300 and add it to the next year

which will give £8,416.20

you repeat that again but with 8,416.20 to the 3rd year and so on and so forth

8 0

1 year ago

25 divided by something = 3 remainder 4

NeX [460]

7 would be the number cause;

25 ÷ 7 = 3 r4

hope that helps :D

8 0

3 years ago