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3 years ago

...............:(. halp plz

Mathematics

1 answer:

Softa [21]3 years ago

8 0

Answer:

A) 5

B) -3

C) -3 or 3

D) -7 or 7

E) -4

Step-by-step explanation:

a) The flea is jumping 4 to the right, which means you add 4 to 1.

b) The flea is jumping 4 to the left, which means you subtract 4 from 1.

c) If the flea is at 0, and is jumping 3 units, it can go either left or right, so you can both subtract 3 or add 3.

d) Like in question c, it is jumping 7 places, so it can either go right or left. So you can subtract or add 7 to/from 0.

e) The flea is to left of 0 by 4 spaces, which means that it's -4. And the absolute value of -4 is 4.

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A bag contains white matarles and red marables,126 in total.The number of whit marables is 6 more than 5 than 5 times the number

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Let number of white marbles be w

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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:

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

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3 years ago