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Softa [21]
2 years ago
14

Draw and Solve: From the top of the Eiffel Tower, which is 986 feet tall a jogger is spotted heading toward the tower. At 2 pm,

the angle of depression of the jogger (4) was measured to be 379. Four minutes later, (B), when measured again, the angle of depression laad increased by 35. Find the average speed of the jogger to the nearest foot per minute. ​
Mathematics
1 answer:
prohojiy [21]2 years ago
3 0
Thank you hope this helps

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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
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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
The cost of renting a video game is $4 per
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Answer:

3

Step-by-step explanation:

4x3=12

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The number of terms in the expression is 2
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3 years ago
My question is 2/5 x 7/9 = ?<br> Do you know what it equals?
GarryVolchara [31]
The answer would be 14/45
6 0
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X + 9 = 7 <br> How do you move the constant to the right side and change it’s sign
Otrada [13]

Step-by-step explanation:

X + 9= 7

get x by itself you -9 on both sides

X + 9 = 7

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8 0
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