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Is this a poisson distribution?

yep

ok

no it is 0.22

how did you get that?

i did not get it. That is the answer.

so now it a bionomial which is very similar to the poission dist.
12C5*(20/46)^5*(26/46)^7

okay. Thanks.

can you do it using the a possion dist?

how??

we have to decide what alpha is first

hmm... i see.

the average for the whole population is the same as the unknown small sample ie 12

i know that part. but how should we figure out?

how did you get 20/46?

ok.

so we worked out alpha = 5.2173913
and x=5

sub into the possion equation
and post your answer

0.6160?

this question is tough.

goodnight

ok. good night