LLD - Design — Food Delivery System
Consider a system where each product stores total rating sum and count. After a new review with rating 4 is added to a product with sum=20 and count=5, what is the new average rating?
Consider a system where each product stores total rating sum and count. After a new review with rating 4 is added to a product with sum=20 and count=5, what is the new average rating?
medium📝 Analysis Q4 of Q15
Step-by-Step Solution
Solution:
Step 1: Calculate new sum and count
New sum = 20 + 4 = 24; new count = 5 + 1 = 6.Step 2: Compute new average rating
Average = 24 / 6 = 4.0.Final Answer:
4.0 -> Option CQuick Check:
Average rating calculation = 4.0 [OK]
Quick Trick: Add new rating to sum, increment count, divide [OK]
Common Mistakes:
MISTAKES- Dividing old sum by new count
- Adding rating but not updating count
- Using incorrect arithmetic order
Master "Design — Food Delivery System" in LLD
Want More Practice?
15+ quiz questions · All difficulty levels · Free
Free Signup - Practice All QuestionsMore LLD Quizzes