1. According to the empirical rule, 68%, 95%, and 99.7% of the data are within ______________ standard deviations of the mean, each. 2. How to find the median of a data set? 3. There are 7 colored pencils in a bag (3 blue, 2 yellow, and 2 pink). What is the probability of choosing a blue pencil and then a pink pencil if the blue is not replaced?