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Using confidence interval formula accuracy is estimates approximately at 95% when {X} is the average of a sample of size n. Use this confidence interval formula as used in statistics to estimate the accuracy. Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/31 Cc: Dorota Czaplejewicz <dorota.czaplejewicz@collabora.co.uk> Signed-off-by: Anand Moon <anandx.ram.moon@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>