Read the following statements carefully: Statement I: The integer used to divide the sum of measurements when calculating an average is an exact number with infinite significant figures. Statement II: If a raw calculated mean is 3.455 cm , it is rounded to 3.46 cm to retain 3 significant figures. Statement III: The sum of 1.2 cm and 3.45 cm has three significant figures. Statement IV: When averaging measurements of t

Step-by-step solution

Statement I is correct: The count of measurements is an exact number and has infinite significant figures. Statement II is correct: To retain 3 significant figures in 3.455 cm , the digit to be dropped is 5. Since the preceding digit (5) is odd, it is increased by 1, giving 3.46 cm . Statement III is incorrect: According to the rules of significant figures for addition, the result must have the same number of decimal places as the term with the least number of decimal places. 1.2 cm + 3.45 cm = 4.65 cm . This must