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Grades like Good (3.50) or Excellent (5.75) are common. Any passing grade at or above the .50 mark is prefixed with the term of the next higher grade. The lowest grade is 2.00; grades below 3.00 are failing grades, and the highest is 6.00.
The United Kingdom slipped into a gold specie standard in 1717 by over-valuing gold at 15 + 1 ⁄ 5 times its weight in silver. It was unique among nations to use gold in conjunction with clipped, underweight silver shillings, addressed only before the end of the 18th century by the acceptance of gold proxies like token silver coins and banknotes.
Rockets from the Falcon 9 family have a success rate of 99.34% and have been launched 458 times over 15 years, resulting in 455 full successes, two in-flight failures (SpaceX CRS-7 and Starlink Group 9–3), one pre-flight failure (AMOS-6 while being prepared for an on-pad static fire test), and one partial failure (SpaceX CRS-1, which delivered its cargo to the International Space Station ...
The Romans used a duodecimal rather than a decimal system for fractions, as the divisibility of twelve (12 = 2 2 × 3) makes it easier to handle the common fractions of 1 ⁄ 3 and 1 ⁄ 4 than does a system based on ten (10 = 2 × 5).