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Robinhood Interview Questions

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<p>Let’s say that you’re a data scientist at Robinhood. </p>

<p>How do we measure the launch of Robinhood’s fractional shares program?</p>


<p>Let’s say you are a data scientist at Robinhood.</p>

<p>Robinhood is introducing a program to allow users to buy fractional shares of publically listed companies.</p>

<p>Focusing in on the activity of new users, which of the following metrics would be the LEAST important to keep track of in determining if the program added value to Robinhood’s platform for new users?</p>


Let's say you are a data scientist at Robinhood. 



Robinhood is introducing a program to allow users to buy fractional shares of publically listed companies.



Focusing in on the activity of new users, which of the following metrics would be the LEAST important to keep track of in determining if the program added value to Robinhood's platform for new users?

Fractional Shares Metrics

Fractional Shares

<p>Let’s say you work for a small airline.
You’re given three tables: <code>flights</code>, <code>planes</code>, and <code>flight_purchases</code>.</p>

<p>Write a query to find the number of unpurchased seats for each flight.</p>

<p>For the purposes of this question, assume that there will be no entries in the <code>flight_purchases</code> table for flights or seats that do not exist.</p>

<p><strong>Example:</strong></p>

<p><strong>Input:</strong></p>

<p><code>flights</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>plane_id</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><code>planes</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>number_of_seats</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><code>flight_purchases</code> table</p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>flight_id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>seat_id</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>
<p><strong>Output:</strong></p>

<table>
<thead>
<tr>
<th>Column</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>flight_id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>free_seats</code></td>
<td>INTEGER</td>
</tr>
</tbody>
</table>


Free Seats

<p>Let’s say you are playing a coin flip game. You start with 30 dollars. If you flip heads, you win one dollar, but if you get tails, you lose one dollar. You keep playing until you run out of money (have 0) or until you win 100 dollars. </p>

<p>What is the probability that you win 100 dollars?</p>


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