uppose you are an analyst for an electronics store chain in Nevada.You are looking at a sales report that details the performance of 3 randomly selected sales agents, each from a different store. The report tells you each agent's sell rate, it tells you the average sell rate for the store, and it tells you the standard deviation for the store. Unfortunately, each store uses a different scoring scale. Here is the data.

Agent Agent sell rate Store avg (median) sell rate Store 5

Sally 2.7 3.2 0.8

Jose 87 75 20

Betty 8.6 8 0.4

what a deviation for a single observation is and what the variance of a set of observations is.

calculate and report the variance for each store.

how the variance tells us how to compare the data we have about each store.

what the standard deviation is and how the standard deviation tells us how well each agent performs in comparison to other agents in their store.

who has the best sell rate, and why their sell rate is best.