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3 years ago

I need help to these two questions please

Mathematics

1 answer:

Vilka [71]3 years ago

4 0

Answer:

second question i think the answer is c .i don't know about first one

Step-by-step explanation:

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Someone help me out with this question please

storchak [24]

Answer: 9.1

Step-by-step explanation:

Add all of the numbers up and divide by 8

6 0

3 years ago

Read 2 more answers

I could really use your help , 25 POINTS!!

In-s [12.5K]

since line AB and CD make all right angles (given) angles 6+7+8 will equal 90 degrees.

According to the verticle angles rule:

angle 2 is equal to angle 6

angle 3 is equal to angle 7

angle 4 is equal to angle 8.

which proves that angle 2+4+7=90 degrees

8 0

3 years ago

The amount of lateral expansion (mils) was determined for a sample of n = 8 pulsed-power gas metal arc welds used in LNG ship co

Alona [7]

Answer:

95% Confidence interval for the variance:

$3.6511\leq \sigma^2\leq 34.5972$

95% Confidence interval for the standard deviation:

$1.9108\leq \sigma \leq 5.8819$

Step-by-step explanation:

We have to calculate a 95% confidence interval for the standard deviation σ and the variance σ².

The sample, of size n=8, has a standard deviation of s=2.89 miles.

Then, the variance of the sample is

$s^2=2.89^2=8.3521$

The confidence interval for the variance is:

$\dfrac{ (n - 1) s^2}{ \chi_{\alpha/2}^2} \leq \sigma^2 \leq \dfrac{ (n - 1) s^2}{\chi_{1-\alpha/2}^2}$

The critical values for the Chi-square distribution for a 95% confidence (α=0.05) interval are:

$\chi_{0.025}=1.6899\\\\\chi_{0.975}=16.0128$

Then, the confidence interval can be calculated as:

$\dfrac{ (8 - 1) 8.3521}{ 16.0128} \leq \sigma^2 \leq \dfrac{ (8 - 1) 8.3521}{1.6899}\\\\\\3.6511\leq \sigma^2\leq 34.5972$

If we calculate the square root for each bound we will have the confidence interval for the standard deviation:

$\sqrt{3.6511}\leq \sigma\leq \sqrt{34.5972}\\\\\\1.9108\leq \sigma \leq 5.8819$

6 0

3 years ago

Layla played sports for 3 3/4 hours. Punish time playing sports was 3/8 as long. About how many hours did puno play sports

Nostrana [21]

I would say 13 3/4 but dont take me for my word

4 0

3 years ago

Can someone please help me with these. I don't get this.

german

The number 5 is 90 degrees, acute

6 0

3 years ago

I need help to these two questions please​

I need help to these two questions please