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mandilynn22
14.07.2019 •
Mathematics
Below are the data collected from two random samples of 500 american adults on the number of hours they work per day (rounded to the nearest hour): number of hours of work per day 6 7 8 9 10 sample a: number of adults 60 90 145 150 55 sample b: number of adults 70 80 140 145 65 ryan concludes that adults spend a mean of 8 hours working each day. malia thinks the mean is 9 hours. who is correct—ryan or malia? explain your answer in two or three sentences. make sure to use facts to support your answer.
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Ответ:
The mean of Sample B is 8.11
Therefore, Ryan is most correct!
Sample A and B were very close in percentages and ratios, hopefully this helps with a sentence or two!
Ответ:
Sample A:
Equation:
(60 * 6) + (90 * 7) + (145 * 8) + (150 * 9) + (55 * 10) = 4050
4050 / 500 = 8.1
8.1 ≈ 8
8.1 rounded is 8
Explanation
For sample A The mean is 8. instead of adding 60 of 6s, i multiplied them, so it wouldn't be 6 + 6 + 6 + 6 and so on till i added 60 of 6s, I multiplied instead of add for each observation.
Secondly, Since we want to find the mean, i divided my sum by 500, because there were 500 observations.
4050 / 500 = 8.1
So,if rounded to nearest whole number for sample A, Ryan is correct. But we have not looked at sample B yet.
Sample B:
Equation:
(70 * 6) + (80 * 7) + (140 * 8) + (145 * 9) + (65 * 10) = 4055
4055 / 500 = 8.11
8.11 ≈ 8
8.11 rounded to 8
Explanation:
In sample B. The mean is 8 as well if rounded. I used to same stratgey as before and instead of adding the observations one by one, I multiplied. Example : instead of 70 of 6s being added one by one, just multiply 70*6, I did that to the other observations as well.
Secondly, Since we wanted the mean, we divided the sum by 500, So it is 4055/500 = 8.11, I could see why Malia thought it was 9, she has to keep in mind that the place of the second digit after the decimal is hundredth.
Hope it helps. :)
Ответ:
Step-by-s
\triangle CBA \sim\triangle EFD
Step-by-step explanation:
\triangle CBA \sim\triangle EFD is the appropriate similarity statement.tep explanation:
hope it helps BC i don't know about it my cousin helped me and he was laughing so sorry if it doesn't help :)