Question

f(y) is a random variable, density function

f(y)= [1-(y/2)] from the interval of (0,2) and it is 0 elsewhere.
find the mean and variance

Answer 1

the mean is the integral x * f(x) , or here integral y * f(y)

Answer 2

also called the expected value of the random variable

Answer 3

wow, you're right lol, I completely plank out on this question

Answer 4

so integrate from 0 to 2

Answer 5

since it is zero elsewhere.

notice that the definition is

Answer 6

draw button is disabled

Answer 7

I got it thanks.