Answer: Option C.
Explanation:
In this type of statistical problems you usually want to find the value of a certain parameter. In this case, the parameter is the average of the voltage of the whole year.
Many times it is difficult to record the values for the entire population (record the voltage every day), and that is why you usually take a sample of the population (some of the days) and find the average voltage based on it to estimate the parameter.
This value that estimates the parameter is called statistic, therefore the correct option is C.
Answer:
66°
Step-by-step explanation:
It is given that :
Distance of the satellite from the tower = 2000 m
Height of the satellite above the tower = 4500 m
Therefore the angle of elevation can be found out by :
![$\tan \theta = \frac{4500}{2000}$](https://tex.z-dn.net/?f=%24%5Ctan%20%5Ctheta%20%3D%20%5Cfrac%7B4500%7D%7B2000%7D%24)
![$\tan \theta = \frac{9}{4}$](https://tex.z-dn.net/?f=%24%5Ctan%20%5Ctheta%20%3D%20%5Cfrac%7B9%7D%7B4%7D%24)
![$\tan \theta = 2.25$](https://tex.z-dn.net/?f=%24%5Ctan%20%5Ctheta%20%3D%202.25%24)
![$\theta = \tan^{-1}(2.25)$](https://tex.z-dn.net/?f=%24%5Ctheta%20%3D%20%5Ctan%5E%7B-1%7D%282.25%29%24)
![$= 66 ^\circ$](https://tex.z-dn.net/?f=%24%3D%2066%20%5E%5Ccirc%24)
Therefore the tower can make contact with GPS satellite when it pointed at 66° angle.
Answer:
41
Step-by-step explanation:
Theorem:
The measure of any exterior angle of a triangle is equal to the sum of the measures of the remote interior angles.
The angle measuring b + 41 is an exterior angle.
The angles measuring b - 2 and b + 2 are the remote interior angles to the exterior angle.
According to the theorem:
b - 2 + b + 2 = b + 41
2b = b + 41
b = 41
Answer: 9.06 × 10(power -4)
Step-by-step explanation: