10 解:L L (4232+4234+4235+4230+4234 10 +42.33+42.37+42.34+4233+4235 ≈4234(cm) ∑(-z) 10-l 0.0188562≈0.02(cm) (-z i=l 005972≈001(cm) 0(10解： = = 10 10 1 1 i L Li 42 32 42 34 42 35 42 30 42 34 10 1 = ( . + . + . + . + .  42.34( cm ) ( ) 0.0188562 0.02(cm) 10 1 L L S 1 0 i 1 2 i =  − − = = ( ) ( ) 0.005972 0.01(cm) 10 S 10 10 1 L L S 1 0 i 1 2 i L = =  − − = = + 42.33 + 42.37 + 42.34 + 42.33 + 42.35 )