Help pls pls pls pls pls pls pls

Mathematics

1 answer:

sergiy2304 [10]2 years ago

8 0

Answer:

485

Step-by-step explanation:

Q(-9) = 6(-9)² - 1 = 6×81 - 1 = 486 - 1 = 485

You might be interested in

Evaluating expressions

Dvinal [7]

Answer:

There is no expression to evaluate.

Step-by-step explanation:

5 0

3 years ago

Tables do not include numerical data. True or false?

stepan [7]

True all table does not need to include numerical data

5 0

3 years ago

Read 2 more answers

Because of staffing decisions, managers of the Gibson-Marion Hotel are interested in the variability in the number of rooms occu

olchik [2.2K]

Answer:

a) $s^2 =30^2 =900$

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

$567.28 \leq \sigma^2 \leq 1690.224$

c) $23.818 \leq \sigma \leq 41.112$

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:

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