Need explanation?

Group of medical researchers collected data from a random sample of individuals on health-related variables. One variable was the pulse rate. They created a histogram to identify the distributional shape of the pulse rate. What shape of the histogram if a) the majority of the sample has higher pulse rates with few had lower pulse rates. b) the majority of the sample has lower pulse rates with few had higher pulse rates c) few people had high pulse rates, and few had low pulse rates. Rest of them were in the middle, around (both sides) of the average value. d) half of the group in the sample have had higher pulse rates, other hall have had no lower pulse rates