Ask question

Ask question

All categories

3 years ago

11

Which values from the specified set make up the solution set of the inequality? r+6≥11 ; {4,5,6,7} Select each correct answer. A

.4 B.5 C.6 D. 7

2 answers:

charle [14.2K]3 years ago

6 0

4+6 = 10>11 so 4 isnt the answer
5+6=11>or = 11 is true
6+6=12>11 is not true
7+6=13>11 is not true

the answer should be B

svetoff [14.1K]3 years ago

6 0

Answer:

it is a and b

Step-by-step explanation:

You might be interested in

An equilateral triangle has a perimeter of 12 x + 18 units. Which expression can be used to show the length of one side of the t

vesna_86 [32]

Kskdkdkkddkkdkdkdkdkdkkdd

4 0

3 years ago

Chris made 4 times as many putts as Paul made at golf practice. Together, they made 60 putts. Which equation below can be used t

alukav5142 [94]

Answer:

A) 5p = 60

Step-by-step explanation:

Since Chris and Paul both made putts totaling 60 and Chris made '4 times as many as Paul', setting up an equation with one variable makes the most sense:

p = number of putts for Paul

4p = number of putts for Chris

4p + p = 60

Combine like terms: 5p = 60

3 0

3 years ago

Read 2 more answers

Find the value of x.

Ede4ka [16]

Step-by-step explanation:

I would assume the answer would be a. 18 assuming your trying to find the entire value of a triangle but have a missing value

5 0

3 years ago

sattari [20]

1. C
2. C
3. D
4. B
5. B

6 0

4 years ago

On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally dist

Fofino [41]

Answer:

a) $8469-1.645\frac{100}{\sqrt{64}}=8448.4$

$8469+1.645\frac{100}{\sqrt{64}}=8489.6$

So on this case the 90% confidence interval would be given by (8448.4;8489.6)

b) $8469-2.054\frac{100}{\sqrt{64}}=8443.33$

$8469+2.054\frac{100}{\sqrt{64}}=8494.68$

So on this case the 96% confidence interval would be given by (8443.33;8494.68)

Step-by-step explanation:

Assuming this complete problem: On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally distributed with s = 100. The composition of the bar has been slightly modified, but the modification is not believed to have affected either the normality or the value of s.

(a) Assuming this to be the case, if a sample of 64 modified bars resulted in a sample average yield point of 8469 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.)

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X=8469$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma=100$ represent the population standard deviation

n=64 represent the sample size

The confidence interval for the mean is given by the following formula:

$\bar X \pm z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that $z_{\alpha/2}=1.645$

Now we have everything in order to replace into formula (1):

$8469-1.645\frac{100}{\sqrt{64}}=8448.4$

$8469+1.645\frac{100}{\sqrt{64}}=8489.6$

So on this case the 90% confidence interval would be given by (8448.4;8489.6)

(b) How would you modify the interval in part (a) to obtain a confidence level of 96%? (Round your answer to two decimal places.)

Since the Confidence is 0.96 or 96%, the value of $\alpha=0.04$ and $\alpha/2 =0.02$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.02,0,1)".And we see that $z_{\alpha/2}=2.054$

Now we have everything in order to replace into formula (1):

$8469-2.054\frac{100}{\sqrt{64}}=8443.33$

$8469+2.054\frac{100}{\sqrt{64}}=8494.68$

So on this case the 96% confidence interval would be given by (8443.33;8494.68)

7 0

3 years ago