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Oduvanchick [21]
3 years ago
5

Whobatman

Mathematics
2 answers:
77julia77 [94]3 years ago
8 0
The best estimate of the population means is always the sample mean. We have the sample values, using them we can find the sample mean.

The sum of the sampled rates = 248
Sample Size = 10

Mean value of the sample = Sum of Sample Rate/Sample Size

So,

Mean of the sample = 248/10 = 24.8

Therefore, we can say that the best estimate for the population mean is 24.8
Angelina_Jolie [31]3 years ago
3 0

Answer:

population mean for fuel consumption among vehicles is 24.8,

Step-by-step explanation:

Given : 32, 24, 14, 34, 26, 27, 31, 16, 18, 26.

To  find : What is the best estimate of the population mean for fuel consumption among vehicles

Solution : We have given that 32, 24, 14, 34, 26, 27, 31, 16, 18, 26.

Mean = \frac{sum\ of\ data}{number\ of\ data}.

Mean = \frac{32+24+ 14+ 34+26+ 27+31+16+18+ 26}{10}.

Mean= \frac{248}{10}.

Mean = 24.8

Therefore, population mean for fuel consumption among vehicles is 24.8

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For what side length(s) is the area of an equilateral triangle equal to 30 cm?? Only enter the number, in centimeters, rounded t
xenn [34]

Answer: The sides length are 8.32 cm

Step-by-step explanation:

An equilateral triangle has all his sides of the same lenght, so we assume that the triangle has an L lenght in his sides.

The area of a triangle is Area = \frac{base * height}{2} where the base is L, the Area is 30 and an unknown height.

To determine the height, we cut the triangle in half and take one side. By simetry, one side has a base of \frac{L}{2}, a hypotenuse of L and a the unknown height.  

Then we apply the <em>Pythagoras theorem</em>, this states that <em>in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides</em>, or, hypotenuse = \sqrt{c^{2} + c^{2} } Where one c is \frac{L}{2} and the other is the height.

Then we find one of the c of the equation wich will be the height.

height = \sqrt{hypotenuse^{2}-base^{2} }

height = \sqrt{ L^{2} -\frac{L}{4} ^{2}}\\height = \sqrt{\frac{ 3L^{2}}{4} } \\\\height = \frac{\sqrt{3}L }{2}

Finally, we use the triangle area mentioned before an find the value of L.

30 = \frac{L*\frac{\sqrt{3}L }{2} }{2} \\\\L = \sqrt{\frac{120}{\sqrt{3} } } \\\\L = 8.32 cm

6 0
3 years ago
Help plsss <br> find length..
posledela
I think it’s been awhile but just ur 140/360 then times that by pi then 2 then times r= 12.22
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Answer:

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