1. M

    Help regarding z-scores and probabilities?

    Can you help me understand how to do these 3 problems? Be specific, please. Here is my homework, word for word: Here we are given the probability, say .9 and we find the values of the random variable (-a and a) that determine a probability of .9 on a standard normal distribution...
  2. S

    Computation of Mean/Average Z-Scores

    Hello, EDIT: I am having trouble uploading my .xls file. I also tried putting the .xls into a .zip but I will always receive an error message. How can I solve this? I am a college student and have just started my first class of statistics. I am quite good at math (taking calculus) but I am...