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3 years ago

9

I need help with this can someone help?

2 answers:

Sedaia [141]3 years ago

7 0

2nd option) The probability of snow on wednesday is -42%

<u>E</u><u>x</u><u>p</u><u>l</u><u>a</u><u>n</u><u>a</u><u>t</u><u>i</u><u>o</u><u>n</u><u>:</u><u> </u> As much I know, probability is never ever negative.. so no doubt opt B is wrong.

Maksim231197 [3]3 years ago

3 0

option second

Step-by-step explanation:

the probability of snow on Wednesday is -42%

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A researcher studied the radioactivity of asbestos. She sampled 81 boards of asbestos, and found a sample mean of 193.2 bips, an

Ksivusya [100]

Answer:

a) Confidence interval is (182.86,203.54).

b) (i) Yes, 200 bips is a true mean as it lie in the interval.

(ii) No, 210 bips is not a true mean as it doesn't lie in the interval.

Step-by-step explanation:

Given : A researcher studied the radioactivity of asbestos. She sampled 81 boards of asbestos, and found a sample mean of 193.2 bips, and a sample standard deviation of 49.5 bips.

To find : (a) Obtain the 94% confidence interval for the mean radioactivity. (b) (i) According the interval that you got, is 200 bips a plausible value for the true mean? (ii) What about 210 bips?

Solution :

a) The confidence interval formula is given by,

$\bar{x}-z\times \frac{\sigma}{\sqrt{n}}$

We have given,

The sample mean $\bar{x}=193.2$ bips

s is the standard deviation $\sigma=49.5$ bips

n is the number of sample n=81

z is the score value, at 94% z=1.88

Substitute all the values in the formula,

$193.2-1.88\times \frac{49.5}{\sqrt{81}}$

$193.2-1.88\times 5.5$

$193.2-10.34$

$182.86$

Confidence interval is (182.86,203.54).

b) (i) According the interval $182.86$

200 bips a plausible value for the true mean as it lies in the interval.

(ii) 210 bips not lie in the confidence interval so it is not a true mean.

3 0

4 years ago

Gina wants to go to the water park with her friends. They have a total of w dollars to buy 5 tickets. Each ticket costs 15 dolla

irinina [24]

Answer:

Step-by-step explanation:

I think 75 dollars

4 0

3 years ago

What is the value of x in the equation -2/9x=2/5

densk [106]

Answer:

x = (-9)/5

Step-by-step explanation:

Solve for x:

(-2 x)/9 = 2/5

Hint: | Multiply both sides by a constant to simplify the equation.

Multiply both sides of (-2 x)/9 = 2/5 by -9/2:

(-9 (-2) x)/(2×9) = (-9)/2×2/5

Hint: | Express (-9)/2×(-2)/9 as a single fraction.

(-9)/2×(-2)/9 = (-9 (-2))/(2×9):

(-9 (-2))/(2×9) x = (-9)/2×2/5

Hint: | Express (-9)/2×2/5 as a single fraction.

(-9)/2×2/5 = (-9×2)/(2×5):

(-9 (-2) x)/(2×9) = (-9×2)/(2×5)

Hint: | In (-9 (-2) x)/(2×9), divide -9 in the numerator by 9 in the denominator.

(-9)/9 = (9 (-1))/9 = -1:

(-2-1 x)/2 = (-9×2)/(2×5)

Hint: | In (-(-2) x)/2, divide -2 in the numerator by 2 in the denominator.

(-2)/2 = (2 (-1))/2 = -1:

--1 x = (-9×2)/(2×5)

Hint: | Multiply all instances of -1 in -(-x).

(-1)^2 = 1:

x = (-9×2)/(2×5)

Hint: | Cancel common terms in the numerator and denominator of (-9×2)/(2×5).

(-9×2)/(2×5) = 2/2×(-9)/5 = (-9)/5:

Answer: x = (-9)/5

7 0

3 years ago

Read 2 more answers

X/2-y+6=0 in slope intercept form

Furkat [3]

Answer:

$y= \frac{1}{2} x +6$

Step-by-step explanation:

$x/2-y+6=0$

$x/2 +6=y$

$y= \frac{1}{2} x +6$

3 0

3 years ago

you play a video game for 15 minutes. you lose 165 points. what is the mean change in points per min?

tia_tia [17]

$165 \div 15 = 11$
If you are constanly loosing points nd at the end you have lost 165, you lost 11 points every minute

8 0

3 years ago