Answer:

1. Quartiles divide the data into four parts; deciles divide the data into 10 parts; percentiles divide the data into 100 parts.
2. It is fundamental concept that Median, second quartile, 5th decile and 50th percentile are same.

3.Common Measures of Position

• Box and Whiskers Plot,
• Deciles,
• Five Number Summary,
• Interquartile Range (IQR),
• Outliers,
• Percentiles,
• Quartiles,
• Standard scores (i.e. z-scores),

Explanation:

correct me if wrong:))