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Karura measured the height, in centimeters of some tree seedlings. He represented the results as follows:
Use the diagram to answer the following questions:
a) How many tree seedlings had a height of 20 cm?
b) How many tree seedlings were below 20 cm?
c) How many more tree seedlings were 22 cm tall than 23 cm tall?
d) How many tree seedlings did Karura measure the height?