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  2. Indonesian rupiah - Wikipedia

    en.wikipedia.org/wiki/Indonesian_rupiah

    As of September 2018, the rupiah had fallen to its weakest position since the 1998 crisis [43] with one US dollar being worth roughly Rp14,880, [44] peaking at Rp. 15,009 on 4 September. By the time COVID-19 pandemic hit the country in March 2020, it fell even further to nearly Rp. 16,650, [ 45 ] nearly reaching the 1998 crisis value, although ...

  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 ...