Here are the results for each of the questions:

a. Median number of calls: 59
The median is the middle value in the sorted dataset.

b. First and third quartiles:

• First quartile (Q1): 52
• Third quartile (Q3): 66
  These represent the 25th and 75th percentiles, respectively.

c. First decile and ninth decile:

• First decile (D1): 48
• Ninth decile (D9): 70.6
  These represent the 10th and 90th percentiles, respectively.

d. 33rd percentile: 54.86
This is the value below which 33% of the data falls.

Would you like further details or explanations? Here are some related questions to expand your understanding:

1. How are percentiles and quartiles calculated from a data set?
2. What is the significance of the interquartile range (Q3 - Q1)?
3. Can you explain the difference between deciles, quartiles, and percentiles?
4. How does the median compare to the mean in this data set?
5. What can the spread of deciles tell you about the data distribution?

Tip: The interquartile range (IQR) is a helpful tool for understanding the spread of the middle 50% of your data!