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3 years ago

57000 x45 pls helppppppp

Mathematics

2 answers:

algol [13]3 years ago

4 0

Answer:

2565000

Step-by-step explanation:

trust me

Varvara68 [4.7K]3 years ago

3 0

Answer:

2565000

Step-by-step explanation:

Easy, multiply them in a table.

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10.

Kay [80]

Answer:

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

$4.535 \leq \sigma^2 \leq 7.602$

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

$2.2 \leq \sigma \leq 2.8$

And the best option would be:

A. 2.2 < σ < 2.8

Step-by-step explanation:

Information provided

$\bar X=32.1$ represent the sample mean

$\mu$ population mean

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 are given by:

$df=n-1=83-1=82$

The Confidence is given by 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , the critical values for this case are:

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

$\chi^2_{1- \alpha/2}=104.139$

And replacing into the formula for the interval we got:

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

$4.535 \leq \sigma^2 \leq 7.602$

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

$2.2 \leq \sigma \leq 2.8$

And the best option would be:

A. 2.2 < σ < 2.8

3 0

3 years ago

3 out of every 5 picks are orange. if 12 picks are orange, how many picks in all?

katen-ka-za [31]

20 picks
is the answer

4 0

3 years ago

The slope of the line whose equation is 3 y = 2 x - 3 is

fiasKO [112]

The photo has the answe

6 0

3 years ago

The length of a rectangle is three times its breadth if the breadth is decreased by 2 m and breadth increased by 4 m the area of

White raven [17]

Answer:

Let the breadth is x, then the length is 3x.

The area is:

A = lw = 3x*x = 3x²

The breadth is decreased by 2 m:

w = x - 2

The length is increased by 4m:

l = 3x + 4

The area is now:

(x - 2)(3x + 4) = 3x² - 1/3(3x²)
3x² + 4x - 6x - 8 = 2x²
x² - 2x - 8 = 0
x² - 2x + 1 = 9
(x - 1)² = 3²
x - 1 = 3
x = 4

The breadth was 4 m and the length 12 m

8 0

2 years ago

The price of Phillips favorite candy has been reduced by 15 cent per piece. Philips buys 14 pieces and spend $3.22 what is the r

Tamiku [17]

Well, if we divide 3.22 by 14 we get 0.23
0.23 +0.15 is 0.38
the answer would be $0.38

8 0

3 years ago

57000 x45 pls helppppppp​

57000 x45 pls helppppppp