Decide which of the following types of data are discrete, which are continuous and which are categorical.

a. The mass of a baby (kg). 

b. The type of transport students use to get to school. 

c. The number of people attending a concert. 

d. The shoe size of students in your class. 

e. The temperature at midday (°C). 

f. The gender of people at a party. 

g. The type of animal treated by a vet. 

h. The speed of cars passing the school (km/h). 

i. The wingspan of a species of butterfly (mm). 

j. The volume of water in a drinking bottle (cm³). 

k. The number of pages in a book. 

l. The height of students in a class (cm).