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3 years ago

3f+7=1 Plz write explanation

Mathematics

1 answer:

frez [133]3 years ago

3 0

Answer:

f = -2

Step-by-step explanation:

3f + 7 = 1

or, 3f = 1 - 7

or, 3f = -6

or, f = -6/3

or, f = -2

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Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy the

Arte-miy333 [17]

Answer:

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%

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

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 1160, \pi = \frac{144}{1160} = 0.1241$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1241 - 1.645\sqrt{\frac{0.1241*0.8759}{1160}} = 0.1082$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.1241 + 1.645\sqrt{\frac{0.1241*0.8759}{1160}} = 0.14$

The 90% confidence interval for the percentage of people the company contacts who may buy something is between 10.82% and 14%

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goblinko [34]

Answer: It is B sorry if took to long

Step-by-step explanation:

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Read 2 more answers

Halla la suma de 3, ocho veces un número, y tres veces el mismo número

Svet_ta [14]

Answer:

3 + 11x

Step-by-step explanation:

Nuestra ecuación será: 3 + 8x + 3x

No sabemos qué es x, así que simplemente sumamos términos semejantes y obtenemos 3 + 11x

Espero que esto haya ayudado, por favor marque lo más inteligente, ¡gracias!

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3 years ago