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2 years ago

PLS HELPP ASP Whats the sum of 8 1/2 2 1/2

Mathematics

1 answer:

kompoz [17]2 years ago

8 0

Answer:

Step-by-step explanation:

1/2 + 1/2 is 1

8 + 2 = 10

1 + 10 = 11

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Twenty less than a number is more than twice the same number . Step by step to get the answer

likoan [24]

20 less than (-20) a number (n) is more than (>) twice the same number (2n)
-20+n>2n
minus n both sides
-20>n
n<-20

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3 years ago

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THIS IS URGENT! PLZ HELP!

Yanka [14]

Answer:

Step-by-step explanation:

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3 years ago

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You have $427 in your bank account and need to pay some bills. The electric bill is $62. The cable bill is $78 and the phone bil

algol13

<span>427 - 62 - 78 - 54 = 233

You will have $233 dollars left in you bank account</span>

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3 years ago

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Plz HURRY!!!

svetoff [14.1K]

Answer:

I'm pretty sure it's B

Step-by-step explanation:

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3 years ago

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83 random samples were selected from a normally distributed population and were found to have a mean of 32.1 and a standard devi

arlik [135]

Answer:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

Step-by-step explanation:

Information given

$\bar X=32.1$ represent the sample mean

$\mu$ population mean (variable of interest)

s=2.4 represent the sample standard deviation

n=83 represent the sample size

Confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The degrees of freedom given by:

$df=n-1=8-1=7$

The confidence level 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 values.

The excel commands would be: "=CHISQ.INV(0.05,82)" "=CHISQ.INV(0.95,82)". so for this case the critical values are:

$\chi^2_{\alpha/2}=104.139$

$\chi^2_{1- \alpha/2}=62.132$

The confidence interval is given by:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

5 0

3 years ago