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uysha [10]
3 years ago
11

How do I solve -1/3y-6=-11

Mathematics
2 answers:
gtnhenbr [62]3 years ago
3 0

Answer:

Step-by-step explanation:

-1/3y - 6 = -11

-1/3y - 6 + 6 = -11 + 6

-1/3y = -5

-1/3y * 3y = -5 * 3y

-1 = -15y

-1 / -15 = -15y / -15y

y = 1/15

Oxana [17]3 years ago
3 0

For this case we must solve the following equation:

- \frac {1} {3}y-6 = -11

We add 6 to both sides of the equation:

- \frac {1} {3} y = -11 + 6\\- \frac {1} {3} y = -5

We multiply by 3 on both sides of the equation:

-y = 3 * (- 5)\\-y = -15

Finally we have:

y = 15

Answer:

y = 15

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Based on historical data, your manager believes that 26% of the company's orders come from first-time customers. A random sample
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Answer:

\hat p \sim N( p, \sqrt{\frac{p (1-p)}{n}})

And we can use the z score formula given by:

z = \frac{\hat p -\mu_p}{\sigma_p}

And if we find the parameters we got:

\mu_p = 0.26

\sigma_p = \sqrt{\frac{0.26(1-0.26)}{158}} = 0.0349

And we can find the z score for the value of 0.4 and we got:

z = \frac{0.4-0.26}{0.0349}= 4.0119

And we can find this probability:

P(z>4.0119) = 1-P(z

And if we use the normal standard table or excel we got:

P(z>4.0119) = 1-P(z

Step-by-step explanation:

For this case we have the following info given:

p = 0.26 represent the proportion of the company's orders come from first-time customers

n=158 represent the sample size

And we want to find the following probability:

p(\hat p >0.4)

And we can use the normal approximation since we have the following two conditions:

1) np = 158*0.26 = 41.08>10

2) n(1-p) = 158*(1-0.26) = 116.92>10

And for this case the distribution for the sample proportion is given by:

\hat p \sim N( p, \sqrt{\frac{p (1-p)}{n}})

And we can use the z score formula given by:

z = \frac{\hat p -\mu_p}{\sigma_p}

And if we find the parameters we got:

\mu_p = 0.26

\sigma_p = \sqrt{\frac{0.26(1-0.26)}{158}} = 0.0349

And we can find the z score for the value of 0.4 and we got:

z = \frac{0.4-0.26}{0.0349}= 4.0119

And we can find this probability:

P(z>4.0119) = 1-P(z

And if we use the normal standard table or excel we got:

P(z>4.0119) = 1-P(z

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A recent study of 26 city residents showed that the time they had lived at their present address has a mean of 10.3 years with t
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Answer:

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Step-by-step explanation:

From the question we are told that

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From the question we are told the confidence level is  95% , hence the level of significance is    

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Generally the margin of error is mathematically represented as  

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Generally 95% confidence interval is mathematically represented as  

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=>   10.3  -1.1532 <  \mu < 10.3  +  1.1532

=>    9.15<  \mu < 11.45

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