Answer:
Step-by-step explanation:
Hello!
To estimate the average number of hours a student their highschool sleeps per night, the students of the statistics class took as sample the first 120 students that arrived at the school on a particular day, out of the 1200 student population, and asked how many hours of sleep they got the night before.
The population of interest is the entire group of experimental units that exists in the world, in this example is the student body of the high school: 1200 students.
The sample is formed by the students that were interviewed: 120 students.
The parameter of interest is the average sleep time per night of the students in high school.
Correct answer:
(D) Sample: the 120 students surveyed. Population: the 1200 students at the high school. Statistic: The average number of hours a student at this high school sleeps per night.
C/30 = 8/12
c/30 = 2/3
3c = 60
c = 60/3
c = 20
Using the Pythagorean’s theorem
Which states that the H^2=P^2+B^2
We can solve for the missing side
First sub in the values and use algebra to solve
Answer:
Step-by-step explanation:
Let be "x" the speed of current (in mph).
According to the exercise, we know that the speed of the steamer in still water is 18 mph, so its speed downstream with the water current is:
Since going downstream it convered the distance between the two ports in 3 hours, then distance is:
[Equation 1]
The speed upstream in mph can be represetend with:
You know that the return trip took 3 hours 40 minutes. Since there are 60 minutes in 1 hour, this time is:
Therefore, the distance travelled upstream is:
[Equation 2]
Make and solve for "x":
Step-by-step explanation:
Significant figures mean all none zero digits so 599.966 to 4 significant figures would be = 600.