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Olin [163]
3 years ago
6

71+50+6x-1=180 excuse the 121

Mathematics
2 answers:
UNO [17]3 years ago
6 0

Answer:

9 1/3

Step-by-step explanation:

That is wrong i tried to answer it but messed up so don't use it

just olya [345]3 years ago
4 0

Answer:

71+50+6x-1=180

121+6x-1=180

121-1+6x=180

120+6x=180

6x=180-120

6x=60

x=60/6

x=10

so the value of x is 10

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An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars over domestic. Step 2 of 2 : S
ziro4ka [17]

Answer:

The 85% onfidence interval for the population proportion of new car buyers who prefer foreign cars over domestic cars is (0.151, 0.205).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

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For this problem, we have that:

Sample of 421 new car buyers, 75 preferred foreign cars. So n = 421, \pi = \frac{75}{421} = 0.178

85% confidence level

So \alpha = 0.15, z is the value of Z that has a pvalue of 1 - \frac{0.15}{2} = 0.925, so Z = 1.44.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.178 - 1.44\sqrt{\frac{0.178*0.822}{421}} = 0.151

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.178 + 1.44\sqrt{\frac{0.178*0.822}{421}} = 0.205

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3 years ago
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riadik2000 [5.3K]
I have included the answer in the picture attached below:

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4 years ago
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