A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 26 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to be
p = 0.071.
What is the upper control limit for a p chart of future absences from this class of size 26?
0.222
0.228
0.638
0.841
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