Probability distribution of selecting a type of battery.

Determine the value of c so that each of the following functions can serve as a probability distribution of the discrete random variable X: (a) f(x) = c(x^2 + 4) for x=0,1,2,3; (b) f(x) = c(2,x)(3,3-x) for x=0,1,2

Separate the 12 face cards from the rest of the deck. Assume that the remaining cards have been shuffled. Select THREE cards from the pile of face cards. How many ways are there of selecting one of each face card from the pile. Second question: How many ways are there of selecting three of the...

I don't understand this whole Z curve stuff could someone explain it to me and help with this example question Find the area under the Z curve corresponding to the each of the z values described below. your answer should be accurate to at least four decimal places. A) less than -0.61 B)...

I've got a significant core population (1.3MM), along with the probability of an event occurring within that population (p of a person making a purchase at a specific store across NA vs. Purchases made at any store across NA). Because there are so many stores, the p for any specific merchant is...