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- From: lotto@math.berkeley.edu (Ben Lotto)
- Newsgroups: sci.math
- Subject: Re: Rounding Rules
- Date: 21 Dec 92 06:28:20
- Organization: U.C. Berkeley Math. Department.
- Lines: 19
- Message-ID: <LOTTO.92Dec21062820@math.math.berkeley.edu>
- References: <1992Dec20.003018.14325@sol.ctr.columbia.edu>
- NNTP-Posting-Host: math.berkeley.edu
- In-reply-to: shaw@toadflax.UCDavis.EDU's message of Sun, 20 Dec 1992 00:30:18 GMT
-
- >>>>> On Sun, 20 Dec 1992 00:30:18 GMT, shaw@toadflax.UCDavis.EDU (Rob Shaw) said:
-
- Rob> What is the rationale behind the following rounding rule?
-
- Rob> when dealing with 5's followed by all zero's, check the
- Rob> next digit to the left. If it's even, round down; odd,
- Rob> round up.
-
- I was told way back in my undergraduate days that one should generally
- "round to evens." Someone recently explained the rationale for this
- as follows. Suppose we start with 1.49 and round in the traditional
- manner twice. First we would round to 1.5 and then to 2. On the
- other hand, if we round just once we get 1. Rounding to evens
- prevents us from getting different answers.
- --
- -B. A. Lotto
- Department of Mathematics/Lake Forest College/Lake Forest IL 60045
- 708-735-5159
- lotto@math.berkeley.edu
-