Use the definitions of expectation and variance.
Integrate by parts,
with
Then
(since the integral of the PDF is 1, and this integral is 4 times that)
Compute the so-called second moment.
Integrate by parts, with
Then
and the variance is
Answer:
3
Step-by-step explanation:
Since it's at the same time of the day, the ratio between the height of the person and the shadow they cast will stay the same. So the man's height to shadow ratio is 6:8 = 3:4. The son's height to shadow ratio would be the same so x:4 = 3:4 therefore his height is 3 feet.
Answer:
1,566,630
Step-by-step explanation:
1854*845=1,566,630
Answer:
35
Step-by-step explanation: