Which culture used cedar oil to preserve enemy heads?

This problem is about what it takes for a function to be a valid probability density function. Consider two functions which are valid probability density functions (PDF).  Which of the following is incorrect?

Take a look at the probability density function of the random variable X given as below:   What is the probability

What role did the Ka, Ba, and Akh play in Egyptian beliefs about the afterlife?

Let X be a uniformly distributed continuous random variable from 0 to 1. Let Y=-ln(1-X) . Find the probability 

There is a deck of cards. You are drawing cards from the deck of cards, and laying them down in front of you one-by-one. How many ways can you do this if the order of the cards in front of you does matter? 

Who held the primary responsibility for burial duties in Hebrew culture?

Which culture buried their dead with red envelopes symbolizing refuge for the soul?

Who was the Egyptian god associated with mummification and guiding souls to the afterlife?

What did the Vikings believe was necessary for a soul to move on to the afterlife?