Indeed interview questions

There are 100 balls, 70 red and 30 blue. If you pick 5 out with replacement, what's the probability that all 5 were red? There are 100 balls, 70 red and 30 blue. If you pick 5 out without replacement, what's the probability that all 5 were red? If you pick 10 out without replacement, what's the probability that all 5 were red and 5 were blue? Some SQL queries (not difficult) Explain A/B testing. Difference between t-test and Z-test. Machine learning question - how to handle missing data?

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