Bare in mind that there is no such a thing as "Normal" number of BM.
There is only "average number between healthy people" ... and "average" is not always the best for everyone.
Different people live different lives, eat different diets and have different needs ... so do not try to say that average is the goal for everybody.
How many times do you eat?
What kind of foods? What amount?
How much are you physically active?
How often do you sweat as a result of your physical activity?
How much do you sleep? At what time do you sleep?
What season of the year is it right now where you are?
These are just some of the factors that will affect the number of bowel movements per day, even if you are 100% healthy.
The number of BM per day is only one of the important factors that says a lot about our health. Quality of BM is more important (smell, color, consistence, soft/hard, easy to get out?) cause quality says more about your health then the frequency alone.
An average healthy person who consumes amount of food that is enough to keep him functioning normally but does not consume too much (2 - 4 meals per day ) ... and is highly physically active, would on average have 1-2 BM per day, sometimes 1, sometimes 2 , 2 if eating more or more often that day. Amount of food and quality of that food can severely affect frequency of BM.
Sometimes, people have 3 MB per day, if they eat larger volume of food, and if food has more fiber (vegans, vegetarians, ... )
Too often is not good, less then once a day is not good.
4 is most often considered too much ... first sign of a problem with food you are eating/ problem with intestines .... or a sign of stress ... or a sign of parasites
.... or a sign of the lack of good bacteria ...
1 BM per day, if you are eating regularly ... is a minimum, but could also be an optimum for some poeple, depends on the amount of food consumed, number of meals, activity, age, ...