Question 860366
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Hi,
Poisson distribution
average: 5 days
TI syntax  P(# &#8804; x)= poissioncdf(mean, largest x-value).
P(6 &#8804; x &#8804; 10) = poissioncdf(5, 10) - poissioncdf(5, 6) = .9863  -.7622
0r if You mean
P(6 < x < 10) = poissioncdf(5, 9) - poissioncdf(5, 7)