2 ms·
> [one que for multiple cashiers] reduces waiting time compared to the one queue per cashier Is this really correct? Shouldn't one grand queue just decrease va
by rightbyte 6y ago
> [one que for multiple cashiers] reduces waiting time compared to the one queue per cashier
Is this really correct? Shouldn't one grand queue just decrease variance, not average?
- kqr 6y agoI Think the intuition is that queuing time is asymmetric around the median, so when you increase variance you also increase the mean. Put another way: if the median is 1 minute, then half the time you'll wait less than 1 minute. The other half you might wait not just for 2 minutes, but significantly more. They won't "cancel out" to preserve the mean.