The heights of four boys measured 152.0 cm, 150.75 cm, 149.5 cm, and 149.25 cm. bradley is the tallest, calvin is taller than josh, but shorter than mark. josh is the shortest. what is mark's height

So, Bradley is the tallest! He's 152.0 cm, then. Josh is the shortest, so he's 149.25 cm:
Bradley: 152.0 cm
???: 150.75 cm
???: 149.5 cm
Josh: 149.25 cm
Then, Calvin is taller than Josh, but he's shorter than Mark. There's only 2 spaces available left, so Calvin is 149.5 cm, and now there's only one slot left, and that means Mark is 150.75 cm.
So: 
Bradley: 152.0 cm
Mark: 150.75 cm
Calvin: 149.5 cm
Josh: 149.25 cm
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