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3 years ago

1+8 pls help me nowwwwww

Mathematics

2 answers:

marta [7]3 years ago

7 0

Answer:

Step-by-step explanation:

The answer is 9. You can figure it out by counting up from 8!

xenn [34]3 years ago

3 0

Your answer would be 9

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In a sample of 330 randomly selected PCC students it was found that 175 of them have a car. Assume this sample comes from a popu

Dvinal [7]

Answer:

a) $0.530 - 1.96\sqrt{\frac{0.530(1-0.530)}{330}}=0.47615$

$0.530 + 1.96\sqrt{\frac{0.530(1-0.530)}{330}}=0.58385$

And if we convert this interval into % we got (47.615%, 58.385%)

b) For this case since the lower value for the confidence interval is a value lower than 0.5 (50%) we don't have enough evidence to conclude at 10% of significance than most students at PCC own a car

Step-by-step explanation:

We can begin calculating the best estimator for the true proportion of students at PCC who own a car:

$\hat p = \frac{175}{330}=0.530$

Part a

The confidence level is 95% , and the significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical values would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The confidence interval for the true proportion is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

Replacing the info given we got:

$0.530 - 1.96\sqrt{\frac{0.530(1-0.530)}{330}}=0.47615$

$0.530 + 1.96\sqrt{\frac{0.530(1-0.530)}{330}}=0.58385$

And if we convert this interval into % we got (47.615%, 58.385%)

Part b

For this case since the lower value for the confidence interval is a value lower than 0.5 (50%) we don't have enough evidence to conclude at 10% of significance than most students at PCC own a car

7 0

3 years ago

Find the Y-intercept and x-intercept of the line: 4x- 6y=21

zimovet [89]

Answer:

Step-by-step explanation:

4x-6y=21

divide by 21

$\frac{4x}{21} -\frac{6y}{21} =1\\or~\frac{x}{\frac{21}{4} } +\frac{y}{-\frac{7}{2} } =1\\x~intercept =\frac{21}{4} =5.25 \\y~intercept=-\frac{7}{2} =-3.5$

6 0

4 years ago

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I need help PLz what is 7/985 I will mark Brainlist to first person that answer.!!!!

bazaltina [42]

Answer:

Jeez, This number is not a whole number. The real answer would be 140.714285714

Step-by-step explanation:

But the rounded answer would be about 141.

3 0

3 years ago

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A system of equations is shown below: Equation A: 4c = d − 8 Equation B: c = 5d + 8 Which of the following steps should be perfo

Alchen [17]

Equation A: 4c = d − 8
Equation B: c = 5d + 8

Multiply Equation A by -5:
Equation A: - 20c = -5d + 40

Equation (1) + (2) :
-19c = 48

Answer: B. Multiply equation A by -5

3 0

3 years ago

I want to know what is 4/8 +8/2 equal to

Alex

Answer:

9/2

Step-by-step explanation:

7 0

3 years ago