<image>To understand how much time the 1000 students of a certain normal university spend on social practice activities each semester, a random survey was conducted on 50 students from the department, and the results were summarized in the following frequency distribution table and frequency distribution histogram. \frac{  } 

The frequency distribution table and frequency distribution histogram are shown below: \frac{       } 

Based on the information provided above, answer the following questions: 
- Complete the frequency distribution table 
- Complete the frequency distribution histogram 
- Please estimate approximately how many students in the mathematics department of this university spend no less than 10 days on social practice activities each semester?