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What are the optimization strategies you're versed in, and can you summarize their operation?

Write a SQL query for the average transaction amount for customers who have made more than 10 purchases in the last 90 days.

How would you approach selecting between Ridge and Lasso regression when presented with a regression problem?

What made you decide to join Dropbox?

Can you explain the process of estimating the probability of ordering a ride using a set of assumptions? What assumptions would be required for this calculation? Furthermore, how would you determine a confidence interval for this probability?

In what ways are supervised, unsupervised, and reinforcement learning distinct in their approach?

Which one do you think is better in terms of speed- subqueries or joins?

What are the situations where you consider mean over median?

What do you know about Least Recently Used (LRU) caches?

Would you mind telling me what you know about Dropbox?