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NeX [460]
2 years ago
10

Help please I’m struggling badly because Im sooo bad at math

Mathematics
1 answer:
bulgar [2K]2 years ago
5 0

Answer:

40˚ degrees

Step-by-step explanation:

HOPE THIS HELPS

PLZZ MARK BRAINLIEST

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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
The point-slope form of the equation of the lin that passes through (–4, –3) and (12, 1) is y – 1 = (x – 12). What is the standa
Natali5045456 [20]
I got -x+y=11 but I’m probably wrong lol
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3 years ago
(QUICK DUE IN 50 MINUTES)
nevsk [136]
Slope =2/3
70,80) (10,40)
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4/6
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8 0
2 years ago
What is the sum of -6 and 9
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Positive 3, If You're starting at -6 and you add the first 6 it's at 0, now you have 3 more to add to make 9. And that gives you positive 3. or if you do 9 - 6 you can get your answer that way too.
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Some teenagers collected trash for a beach clean-up. The data for the number of pounds of trash collected by each teenager are s
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