It depends. If the museum is famous and popular then there could be more than 100 people there. If the museum is small and unknown, then there could be very small groups. I didn't really understand your question but I hope this helps!
Karma is related to reincarnation because who or what you reincarnate to relates to karma. If you did good deeds, lived a good life, then you have good karma and reincarnate to something better then you were in your previous life. If you did bad things then you would have bad karma, and get the bad thing you did done to you in your next life.
