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gladu [14]
3 years ago
12

Roger can make 3 bird houses in 5 hours. Which proportion could be used to determine how many bird houses Roger could build in 2

0 hours?
Mathematics
1 answer:
Nadya [2.5K]3 years ago
6 0

Answer:

the answer should be 12

Step-by-step explanation:

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AlexFokin [52]
(d) 18/48

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IgorC [24]

Answer:

32

Step-by-step explanation:

Do 5x5 then add 7.

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The weights of 67 randomly selected axles were found to have a variance of 3.85. Construct the 80% confidence interval for the p
VLD [36.1K]

Answer:

3.13

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 67

Variance = 3.85

We have to find 80% confidence interval for the population variance of the weights.

Degree of freedom = 67 - 1 = 66

Level of significance = 0.2

Chi square critical value for lower tail =

\chi^2_{1-\frac{\alpha}{2}}= 51.770

Chi square critical value for upper tail =

\chi^2_{\frac{\alpha}{2}}= 81.085

80% confidence interval:

\dfrac{(n-1)S^2}{\chi^2_{\frac{\alpha}{2}}} < \sigma^2 < \dfrac{(n-1)S^2}{\chi^2_{1-\frac{\alpha}{2}}}

Putting values, we get,

=\dfrac{(67-1)3.85}{81.085} < \sigma^2 < \dfrac{(67-1)3.85}{51.770}\\\\=3.13

Thus, (3.13,4.91) is the required 80% confidence interval for the population variance of the weights.

8 0
3 years ago
What is the equation of this graphed line?
o-na [289]

Answer:

y = 2x + 2

Step-by-step explanation:

Notice that this line passes thru (-4, -6) and (2, 6). As we move from (-4, -6) and (2, 6), x increases by 6 and y increases by 12.  Thus, the slope is

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From the graph we can see that the y-intercept is (0,2).  Thus, the slope-intercept equation of this line is:

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answer

Step-by-step explanation:

This means that the point 3 is placed in quarters 3.

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