Image. What formula should be used so that the number in cell A4 corresponds to a certain Poisson probability (highlighted in yellow and =0.8) from the data range in column "B"?
By hand, I made a table next to it. The number should be 99 for probability =0.8. But how do I find it with one formula for column "B"?
Can you try:
=let(Σ,sequence(max(B:B)-min(B:B)+1,1,max(B:B),-1),
xlookup(A2,index(poisson(Σ,average(B:B),1)),Σ,,1))