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3 years ago

The radius is 11cm and 135 degrees find the perimeter

Mathematics

1 answer:

leva [86]3 years ago

7 0

Answer: = 47.9cm

Step-by-step explanation:

c = 22cm

22π/360

x = 8.25π cm

p = 22 + 8.25π = 47.9cm

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Scorpion4ik [409]

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3 years ago

A sample of 50 cotton threads shows the mean breaking strength to be 220 grams and the sample standard deviation to be 12 grams.

xenn [34]

Answer:

$220-2.01\frac{12}{\sqrt{50}}=216.589$

$220+2.01\frac{12}{\sqrt{50}}=223.411$

The confidence interval for this case would be (216.589, 223.411)

Step-by-step explanation:

Information given

$\bar X=220$ represent the sample mean

$\mu$ population mean

s=12 represent the sample standard deviation

n=50 represent the sample size

Confidence interval

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

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

The degrees of freedom are given by:

$df=n-1=50-1=49$

The Confidence level is 0.95 or 95%, the significance is $\alpha=0.05$ and $\alpha/2 =0.025$ , the critical value for this case is $t_{\alpha/2}=2.01$

And replacing we got:

$220-2.01\frac{12}{\sqrt{50}}=216.589$

$220+2.01\frac{12}{\sqrt{50}}=223.411$

The confidence interval for this case would be (216.589, 223.411)

6 0

3 years ago

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True [87]

Answer:

5 and -4

Step-by-step explanation:

Answer is 5 and -4

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Answer:

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Step-by-step explanation:

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