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Alla [95]
3 years ago
5

Yearbook sales this year increased 120% over last years yearbook sales. If 465 yearbooks were sold last year, how many were sold

this year?
Mathematics
2 answers:
dalvyx [7]3 years ago
7 0

Answer:

This year 1,023 books were sold.

Step-by-step explanation:

Last year the number of yearbooks were sold = 465

This year sales are increased 120% over last years sales.

this year sale = 465 + (120% of 465)

                      = 465 + (\frac{120}{100} × 465)

                     = 465 + (1.2 × 465)

                     = 465 + 558

                     = 1,023 books

This year 1,023 books were sold.

uranmaximum [27]3 years ago
4 0
First turn the percent into a decimal. It would be 1.20.
Multiply 465 and 1.20.
465 x 1.20=558
Then add 465 and 588 to get the final amount.
465+558=1023
There were 1,023 yearbooks sold this year.
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Answer:

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Now we can calculate the p value based on the alternative hypothesis with this probability:

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Step-by-step explanation:

Information given

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X=75 represent the number of people Liberal

\hat p=\frac{75}{200}=0.375 estimated proportion of people liberal

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z would represent the statistic

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Hypothesis to test

We want to verify if the true proportion of adults liberal is higher than 0.24:

Null hypothesis:p \leq 0.24  

Alternative hypothesis:p > 0.24  

The statistic is given by:

z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}} (1)  

Replacing the info given we got:

z=\frac{0.375 -0.24}{\sqrt{\frac{0.24(1-0.24)}{200}}}=4.47  

Now we can calculate the p value based on the alternative hypothesis with this probability:

p_v =P(z>4.47)=0.00000391  

The p value is very low compared to the significance level of \alpha=0.05 then we can reject the null hypothesis and we can conclude that the true proportion of people liberal is higher than 0.24

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