1. Here are the numbers of computers sold by an office supply store on the 15 business days before Christmas: 4 8 6 8 3 10 9 4 9 6 6 12 7 10 7. Calculate the percentile of December 20%, where 10 computers were sold.

2. Describe a situation that would yield a positively-skewed distribution.

3. What does a z-score indicate?

4. what is the relationship between the mean, median, and mode of a normal distribution?