Calculate the daily number of videos viewed on YouTube.

This question requires you to estimate or speculate about the total number of YouTube videos viewed daily around the globe. It resembles a Fermi problem, where you're expected to make a series of informed guesses, assumptions, and calculations. While providing an exact figure may not be necessary, the interviewer is more interested in your thought process, deductive reasoning, and estimation abilities. When responding to this question, keep in mind: Population size: Think about estimating the number of users who might watch YouTube on a daily basis, including both active and passive viewers. User behavior: Assess how often these potential viewers might watch YouTube videos each day. Video length: Remember that not every video will be viewed in its entirety, among other considerations.

Let's break down the estimation process step by step. Assuming the global population is roughly 7.7 billion, and estimating that 60% have internet access, we arrive at about 4.62 billion potential YouTube viewers. However, not all internet users will watch YouTube on a daily basis. Let's assume that 50% of them do, reducing our estimate to 2.31 billion daily viewers. Regarding how often videos are watched, it seems reasonable to suggest that, on average, a viewer might watch around 5 videos each day. This average accommodates both frequent users who may watch many videos daily and those who watch only one or two. By multiplying the estimated number of YouTube viewers by the average number of videos they watch, we get: 2.31 billion viewers * 5 videos/viewer = approximately 11.55 billion videos viewed each day.

Let’s approach this by reflecting on our personal experiences with YouTube and projecting them on a global scale. If we take into account a global population of 7 billion, and assume that half of them have internet access, that gives us an audience of 3.5 billion. If we further narrow it down to say that only half of these internet users watch YouTube daily, we arrive at 1.75 billion daily viewers. On average, a YouTube user might view around 3-4 videos each day; for the sake of our estimation, let’s use 3 videos. Based on this information, we can estimate the total number of videos watched on YouTube each day as follows: 1.75 billion viewers * 3 videos per viewer = roughly 5.25 billion videos watched daily.