the length of a piece of string is known to be exactly 9.84 cm. two students measured the string. student A used a ruler marked in centimeters and got a measurement of 10 cm. student B used a ruler marked in millimeters and centimeters and got a measurement of 9.8 cm. how precise is the ruler originally used to measure the string ? explain

Question

the length of a piece of string is known to be exactly 9.84 cm. two students measured the string. student A used a ruler marked in centimeters and got a measurement of 10 cm. student B used a ruler marked in millimeters and centimeters and got a measurement of 9.8 cm.  how precise is the ruler originally used to measure the string ? explain

Ms. Sue · Answer

See Drwls' answer from a few hours ago. http://www.jiskha.com/display.cgi?id=1254493221

Ms. Sue · Answer

Please do not keep posting the same question. If there's something you don't understand about an answer, please be specific about what is you don't understand.