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  2. ACN-PCN method - Wikipedia

    en.wikipedia.org/wiki/ACN-PCN_method

    The Aircraft Classification Number (ACN) – Pavement Classification Number (PCN) method is a standardized international airport pavement rating system promulgated by the ICAO in 1981. The method has been the official ICAO pavement rating system for pavements intended for aircraft of apron (ramp) mass greater than 5700 kg from 1981 to 2020. [ 1 ]

  3. x̅ and R chart - Wikipedia

    en.wikipedia.org/wiki/X̅_and_R_chart

    As with the ¯ and s and individuals control charts, the ¯ chart is only valid if the within-sample variability is constant. [4] Thus, the R chart is examined before the x ¯ {\displaystyle {\bar {x}}} chart; if the R chart indicates the sample variability is in statistical control, then the x ¯ {\displaystyle {\bar {x}}} chart is examined to ...

  4. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two numbers that precede it. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted F n .

  5. List of floppy disk formats - Wikipedia

    en.wikipedia.org/wiki/List_of_floppy_disk_formats

    1 16 140 kB 3 1 ⁄ 2 inch Double 1 80 Variable (8-12) 512 400 kB 394 - 590 GCR [NB 3] 2 800 kB High 2 80 18 512 1,440 kB 300 MFM [NB 4] Apple Lisa: 5 1 ⁄ 4 inch FileWare: Double 2 46 Variable (15-22) 512 soft 851 kB 218 - 320 [19] GCR Apple Lisa 2/Macintosh XL, Macintosh 3 1 ⁄ 2 inch Double 1 80 Variable (8-12) 512 soft 400 kB 394 - 590 GCR