3 years ago

Please help me thank you

Mathematics

2 answers:

Vlad1618 [11]3 years ago

6 0

Search up the area formula for the shapes.Than put in the numbers.After solving dont forget the unit

frutty [35]3 years ago

5 0

Answer:

Step-by-step explanation:

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A stream begins at an elevation of 200 meters and flows a distance of 400 kilometers to the ocean? what is the average gradient?

nekit [7.7K]

Change in y = -200 meters
change in x = 400,000 meters

slope = change in y / change in x = -200/400,000 = -1/2,000 meters

8 0

3 years ago

Read 2 more answers

Five students visiting the student health center for a free dental examination during National Dental Hygiene Month were asked h

Andrews [41]

Answer:

[0.9 months, 32.69 months]

Step-by-step explanation:

The mean is

$\bf \bar x=\frac{5+17+12+21+29}{5}=16.8$

The standard deviation is

$\bf s=\sqrt{\frac{(5-16.8)^2+(17-16.8)^2+(12-16.8)^2+(21-16.8)^2+(29-16.8)^2}{5}}=8.1092$

Now, we have to find two values a and b such that the area under the Normal curve with mean 16.8 and standard deviation 8.1092 between a and b equals <em>95% = 0.95 </em>

Using a spreadsheet we find these values are

a = 0.906

b = 32.694

<h3>(See picture) </h3>

and our 95% confidence interval for the mean number of months elapsed since the last visit to a dentist for the population of students participating in the program rounded to two decimal places is

[0.9 months, 32.69 months]