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alisha [4.7K]
3 years ago
7

Sue sold 26 more newspapers than bill, and bill sold three times as many as Harry. If Harry sold p newspapers, how many did Sue

sell?
Mathematics
1 answer:
alexdok [17]3 years ago
7 0

Answer:

3p + 26  

Step-by-step explanation:

Let S = Sue's newspapers sold

     B = Bill's newspapers sold

     H = Harry's newspapers sold.

We have three conditions:

(1)   S = B + 26

(2)  B = 3H

(3)  H = p     Substitute (3) into (2)

(4) B = 3p     Substitute (4) into (1)

      S = 3p + 26

Sue sold 3p + 26 newspapers.

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Suppose the true proportion of students at a college who study abroad is 0.25. I select a random sample of 40 students from the
Julli [10]

Answer:

\mu_{\hat p} = 0.25

\sigma_{\hat p}= \sqrt{\frac{0.25*(1-0.25)}{40}}= 0.0685

z = \frac{0.2-0.25}{0.0685}= -0.730

And we can use the normal standard distribution or excel to find this probability and we got:

P(\hat p

Step-by-step explanation:

We define the parameter as the proportion of students at a college who study abroad and this value is known p =0.25, we select a sample size of n =40 and we are interested in the probability associated to the sample proportion, but we know that the distirbution for the sample proportion is given by:

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

And the paramters for this case are:

\mu_{\hat p} = 0.25

\sigma_{\hat p}= \sqrt{\frac{0.25*(1-0.25)}{40}}= 0.0685

We want to find the following probability:

P(\hat p< 0.2)

For this case since we know the distribution for the sample proportion we can use the z score formula given by:

z = \frac{\hat p -\mu_{\hat p}}{\sigma_{\hat p}}

Replacing the info given we got:

z = \frac{0.2-0.25}{0.0685}= -0.730

And we can use the normal standard distribution or excel to find this probability and we got:

P(\hat p

8 0
3 years ago
Determine the truth value of each statement based on the expression.
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3 years ago
Jonas has been saving for a video game . last year it costs $28 this year it costs $36 find the percent of change in the cost .
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Answer:

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There has been a 28.6% of change in the cost.

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