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3 years ago

Can someone answer this question please please answer it correctly I’d it’s correct I will mark you brainliest please help me

Mathematics

1 answer:

AVprozaik [17]3 years ago

3 0

Answer:

6.28

Step-by-step explanation:

Area=πx2^2

Area=4π

Area=4π/2

Area=2π

Area=6.283185307

Area=6.28

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Answer of question to know what to do the answer

jek_recluse [69]

What the heckk??????????

6 0

3 years ago

We wish to give a 90% confidence interval for the mean value of a normally distributed random variable. We obtain a simple rando

coldgirl [10]

Answer: $(9.27025,\ 11.12975)$

Step-by-step explanation:

Given : Sample size : n= 9

Degree of freedom = df =n-1 =8

Sample mean : $\overline{x}=10.2$

sample standard deviation : $s= 1.5$

Significance level ; $\alpha= 1-0.90=0.10$

Since population standard deviation is not given , so we use t- test.

Using t-distribution table , we have

Critical value = $t_{\alpha/2, df}=t_{0.05 , 8}=1.8595$

Confidence interval for the population mean :

$\overline{x}\pm t_{\alpha/2, df}\dfrac{s}{\sqrt{n}}$

90% confidence interval for the mean value will be :

$10.2\pm (1.8595)\dfrac{1.5}{\sqrt{9}}$

$10.2\pm (1.8595)\dfrac{1.5}{3}$

$10.2\pm (1.8595)(0.5)$

$10.2\pm (0.92975)$

$(10.2-0.92975,\ 10.2+0.92975)$

$(9.27025,\ 11.12975)$

Hence, the 90% confidence interval for the mean value= $(9.27025,\ 11.12975)$

6 0

2 years ago

Casandra is training for a 10 mile race.On the first day of training she runs 4 miles, each day after that sge adds on 0.5 mile.

AnnyKZ [126]

Answer:

8 days

Step-by-step explanation:

3 0

3 years ago

Can some one PLS help me with this problem it will be great x+5<-4

lubasha [3.4K]

Answer:

The answer is <em>x<-9</em>

Step-by-step explanation:

x+5<-4

You move it to the right and you change the sign

This is what I mean: x<-4-5

Then you Calculate the Difference

So it will be: <em>x<-9</em> which is your answer

3 0

3 years ago

HELP PLEASE

ella [17]

The answer is 40 inches. Reason is a^2 + b^2 = c^2. A is 42. B is unknown. C is 58. Taking that information it is 40 inches

7 0

2 years ago