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In general, the number of nines is not often used by a network engineer when modeling and measuring availability because it is hard to apply in formula. More often, the unavailability expressed as a probability (like 0.00001), or a downtime per year is quoted. Availability specified as a number of nines is often seen in marketing documents.
Five-9's (99.999%) means less than 5 minutes when the system is not operating correctly over the span of one year. Availability is only meaningful for supportable systems. As an example, availability of 99.9% means nothing after the only known source stops manufacturing a critical replacement part.
Every 72 090 years (thrice in history of modern humankind) μ ± 6σ: 0.999 999 998 026 825: 1.973 × 10 −9 = 1.973 ppb: 1 in 506 797 346: Every 1.38 million years (twice in history of humankind) μ ± 6.5σ: 0.999 999 999 919 680: 8.032 × 10 −11 = 0.080 32 ppb = 80.32 ppt: 1 in 12 450 197 393: Every 34 million years (twice since the ...
It is accepted by all four-year colleges and universities in the United States as well as more than 225 universities outside of the U.S. The main four ACT test sections are individually scored on a scale of 1–36, and a composite score (the rounded whole number average of the four sections) is provided. [11]
A Cisco router had been reported to have been running continuously for 21 years as of 2018. [6] As of April 11, 2023, the uptime had increased to 26 years, 25 weeks, 1 day, 1 hour, and 8 minutes until the router was later decommissioned and the final report of the uptime was 26 years, 28 weeks, 2 days, and 6 minutes. [7] [8]
This is an accepted version of this page This is the latest accepted revision, reviewed on 8 February 2025. This article needs to be updated. Please help update this article to reflect recent events or newly available information. (March 2022) World map of countries shaded according to the literacy rate for all people aged 15 and over This is a list of countries by literacy rate. The global ...
The number , whose typical value is close to but not greater than 1, is sometimes given in the form (or as a percentage % ()), where is a small positive number, often 0.05. By definition, the bounds () and () are to be constructed in such a way that as long as is collected randomly, i.e. the model assumption about its probability distribution ...
The slogan "We are the 99%" became a unifying slogan of the Occupy movement in August 2011 [2] after a Tumblr blog, "wearethe99percent.tumblr.com," was launched in late August 2011 by a 28-year-old New York activist going by the name of "Chris" together with Priscilla Grim. [3] [4]