Overview
Numbers ki list ka total (sum) aur average nikalna — statistics ka basic foundation.
Analogy
Jaise exam ke marks add karo aur class ka average nikalo.
Step-by-step
- sum(list) se total nikalo
- Average = sum / len(list)
- len() se count lo
- Empty list check karo (division by zero!)
Visual
marks = [85, 92, 78, 95, 88]
total = sum(marks) # 438
avg = total / len(marks) # 87.6
Common mistakes
- Empty list mein sum/len — ZeroDivisionError aata hai
- Integer division // use karna floating average ke liye
- sum() sirf numbers ke liye, strings ke liye nahi
Practice questions
- Student marks ka average nikalo
- Running average calculate karo as elements aate jaate hain