You are asked to discuss the Z score and Z tables in a statistics webinar. As part of this task, you need to identity what a Z score represents, the main assumption surrounding the use of the Z tables (i.e., what probability distribution the Z tables can be used for) and also to identify the upper and lower limits of the values found in the "body" of the Z tables.

a) Tell us what a Z score of +2.5 represents? What does a Z-score of -2.5 represent?

b)What is the core assumption underlying the use of the Z score and tables? (i.e., what is the name of the probability distribution for which we can use Z tables)

c)The values in the Z tables represent probabilities. What are the maximum and minimum probability values found within the Z tables?