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There are four numbered interval on the scale going from 0–3. There are nine markers between each numbered interval. ‘(a)’ has an arrow that points to the fifth marker after ‘0’. ‘(b)’ has an arrow that points to the sixth marker after ‘1’. ‘(c)’ has an arrow that points to the third marker after ‘2’. ‘(d)’ has and arrow that points between the sixth and seventh marker after ‘2’.

 5.2 Scales and measuring instruments