Two machines, $$\(A\)$$ and $$\(B\)$$, produce metal rods of a certain type. The lengths, in metres, of 19 rods produced by machine $$\(A\)$$ and 19 rods produced by machine $$\(B\)$$ are shown in the following back-to-back stem-and-leaf diagram. Key: 7 22 4 means 0.227 m for machine A and 0.224 m for machine B . Hence make two comparisons between the lengths of the rods produced by machine $$\(A\)$$ and those produced by machine $$\(B\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

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