A funnel is the best way to approach estimations or estimation questions. First, you start with the broadest possible view, and work your way down to the nitty gritty. This approach is explained in more detail below. In this particular case, you know that you are trying to find out how many ping-pong balls fit in a 747 aircraft. A ping-pong ball's volume is the first thing you should determine.
If your interviewer asks you for a guesstimate or estimation, you must determine whether your assumptions will have to be based on any directions provided by them. Therefore, you should begin your analysis of a guesstimate or estimation case question by asking the interviewer, “What is the volume of a single ping pong ball?ball?ball? .” If the interviewer does not respond, then you know you must determine the answer first. In that case, you have to answer questions based on the information that was provided during the interview. We will assume, for the purposes of this example, that your interviewer wants you to make the assumptions. We propose the following dialogue.
In simple terms, you get the number when you divide the volume of the boeing by the volume of the ball. There are always voids between balls, which makes it difficult to pack more balls (unless you have smaller balls that can fill the voids between balls that are bigger). If you have voids in your calculation, you should multiply it by 0.75. In this case, the balls would be packed tightly. Alternatively, you can multiply by about 0.6. The 75% factor is important enough to account for, in my opinion. Read Moree at https://pingpongbuzz.com/how-many-ping-pong-balls-fit-in-a-747/