Which of the following functions can be a probability densit

Which of the following functions can be a probability density function for some continuous random variable. Explain your reasoning. f(t)={e^t+4t-e, 0 for 0

Solution

if you use integrals and the value of integral is 1 , then is a probability density function

1) is a probability density function

2) is a probability density function

3) this is not a PDF

4)

this is not PDF