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3 years ago

a rectangular swimming pool has a with of 25feet and an area of 1225 squares feet, what is the pools length

Mathematics

2 answers:

TEA [102]3 years ago

7 0

The answer would be 49ft.
1,225ft÷25ft=49ft

love history [14]3 years ago

3 0

S-length

s*25=1225
1225:25=s
s = 49(feet)

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Brand 1 Brand 2 Difference

37734 35202 2532

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

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

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

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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

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

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3 years ago

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x0 = 1 , x1 = 1.2, x2 = 1.4, x3 = 1.6 ....... x(10) = 3

So we have , using Simpsons rule:-

S10 = (1/15) ( f(x0) + 4 f(x1) + 2 f)x2) +.... + f(x10) )

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