From the given information,
Then, the expected value of the X random variable is
Thus, the expected value of the X random variable is 0.
Then, the variance of the X random variable is
Thus, the variance of the X random variable is 1.
Answer is given below (on video)
A radar station, located at the origin of xz plane, as shown in the figure , detects an airplane coming straight at the station from the east. At first observation (point A), the position of the airplane relative to the origin is
Define the displacement of the airplane while the radar was tracking it:
A sled with rider having a combined mass of 120 kg travels over the perfectly smooth icy hill shown in the accompanying figure. How far does the sled land from the foot of the cliff (in m)?