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andreev551 [17]
11 months ago
7

Write a fact family for each set of numbers.

Mathematics
1 answer:
tatyana61 [14]11 months ago
4 0

Answer: in every case, the first two number multiplied equal the third number, I don't quit understand if that's the answer you were looking for,

but that's the first thing that occurred to me

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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
Oh please help me with this!!!
Vesna [10]

Answer:

x+74=180

x=180-74

x=106

x=4y+22

106-22=4y

84/4=y

21=y

y=21

Step-by-step explanation:

7 0
3 years ago
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What is the value of x
larisa86 [58]
X = 3.916
Sorry if the image is hard to read I had to smoosh it so it would fit

8 0
2 years ago
Solve for y: 2(3y + 5) = 3 (5y +1/3).
kaheart [24]

Answer:

2(3y + 5) = 3 (5y +1/3)

6y+10=15y+1

9=9y

y=1

4 0
2 years ago
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Which theorem or postulate justifies this statement?
nydimaria [60]

Answer:

I used to know how to do this

Step-by-step explanation:

I forgot tho sorry

5 0
3 years ago
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