Plz help!!!

Mathematics

1 answer:

kvv77 [185]3 years ago

6 0

Answer:

Step-by-step explanation:

Here, y = 10 million = 10000000

$10000000 = \frac{1}{2}*(1.21)^x$

Simplifying and taking natural log on both sides:

$ln(20000000) = x*ln(1.21)$

x = 88.19 years

The number of snowboarders will be 10 million for the first time in year 2076.

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Answer:

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b) $\frac{(19)(30)^2}{30.144} \leq \sigma^2 \leq \frac{(19)(30)^2}{10.117}$

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Step-by-step explanation:

Assuming the following question: Because of staffing decisions, managers of the Gibson-Marimont Hotel are interested in the variability in the number of rooms occupied per day during a particular season of the year. A sample of 20 days of operation shows a sample mean of 290 rooms occupied per day and a sample standard deviation of 30 rooms

Part a

For this case the best point of estimate for the population variance would be:

$s^2 =30^2 =900$

Part b

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$