<human>:  Why is the bell curve symmetrical?
<bot>: It’s symmetrical because the probability of an event is the same for any value of x. For example, if you roll a die, the probability of getting a number between 1 and 6 is exactly the same as the probability of getting a number between 7 and 12. The bell curve is symmetrical because the probability of an event is the same for any value of x.