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This post was last edited by zjp on 2015-9-24 at 15:27. In order to increase the popularity of the chemical analysis section, the previous 【Weekly Topic】 activity has been replaced with a 【Daily Question】 activity; this helps to foster an active atmosphere for technical exchanges while also providing members with financial rewards. 【Daily Question】 (Single-choice question) Among the following four values, which one becomes 0.7314 when expressed with four significant figures? A. 0.73146 B. 0.731349 C. 0.73145 D. 0.731451 Standard answer: C. 0.73145; the rule is: round to the nearest, with ties going to even ； If the value is non-zero after five, increment by one; if it’s all zeros after five, consider its parity. If the value is even before five, discard it; if it’s odd before five, increment by one. Reply with your answer in the comments – this earns you +2 wealth points for participating. If you get all answers correct, you’ll receive an additional +3 to +8 wealth points. Those who provide thorough analysis and explanations for the questions or answers, or who include detailed calculation processes, will receive extra wealth rewards. If your answer is correct and your analysis is accurate, it will be marked as the best reply (or the best assistance). Feel free to answer the questions. Note: We will close this post after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation.
Among the following four values, the one that becomes 0.7314 after being adjusted to four significant figures is (B).
Among the following four values, the one that becomes 0.7314 after being adjusted to four significant figures is (B). A.0.73146 B.0.731349 C.0.73145 D.0.731451
C, 0.73145! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !
For option D, when rounding, if the fifth digit is 5, then one must consider the parity of the fourth digit: if it is odd, the value is increased by 1; if it is even, the value is dropped.
C、------------------------------
Among the following four values, the one that becomes 0.7314 after being adjusted to four significant figures is (C. 0.73145). The common method of rounding is to round off. However, according to statistical data, this method is not very accurate and can lead to significant errors in statistics. For greater accuracy, it is better to use the rule of rounding up or down depending on whether the digit is 4 or less. In other words, if the digit in the position that needs to be retained is 4 or less, it is dropped; if it is 6 or more, the next digit is increased by one. When the digit is 5, the decision depends on whether the digit in the higher place value is odd or even – if it’s odd, the next digit is increased; if it’s even, it is dropped. For example, 0.73145 rounded to four significant figures becomes 0.7314. Additionally, if there is a non-zero digit after 5, then the next digit must also be increased. For example, 0.731451, when rounded to four significant figures, becomes 0.7315 ； 0.7314509, when rounded to four significant figures, is 0.7314.
Among the following four values, the one that becomes 0.7314 after being adjusted to four significant figures is (B).
Among the following four values, which one becomes 0.7314 after being adjusted to four significant figures? D
Among the following four values, the one that becomes 0.7314 after being adjusted to four significant figures is (C). A.0.73146 B.0.731349 C.0.73145 D.0.731451