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3 years ago

Please be quickly I beg you

Mathematics

1 answer:

OverLord2011 [107]3 years ago

3 0

The shape is a rectangle, i’m not familiar with the other problem though sorry :/

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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 $2722.396$

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3 years ago

A pie can be cut into more than seven pieces by making four diameter cuts.

n200080 [17]

I'm pretty sure it's true

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3 years ago

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Math problem need help plz

alexira [117]

Answer:

angle LXZ is 121°

Step-by-step explanation:

Since the sum of same side interior angles equals 180 you just subtract the angle you're given from 180 (180°-59°=121°)

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3 years ago

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Ronch [10]

Answer:

Step-by-step explanation:

44 - 25% off is 33

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Jenny wants to buy cereal that comes in large and small boxes. the 32-ounce box costs $4.16, and the 14-ounce box costs $2.38. W

Phoenix [80]

The large box is less expensive per ounce.


    large box small box
cost   4.16 2.38
content 32oz 14oz

cost/oz 0.13 0.17
*4.16/32 *2.38/14

The large box is less expensive than the small box. The large box is cheaper by 0.04 per ounce.

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3 years ago

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