Session Length Distribution
Build a histogram of session durations split into buckets [0-5), [5-10), [10-15), 15+. For each bucket return the number of sessions.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| bin | total |
|---|---|
| [0-5> | 5 |
| [5-10> | 3 |
| [10-15> | 2 |
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