A population of rare and endangered birds is found in the woods behind your apar

Question

A population of rare and endangered birds is found in the woods behind your apartment and you have volunteered to keep the neighbour hood cats from eating the chicks.To keep a stable population of birds, each of the 12 pairs must successfully raise 4 chicks. The average number of chicks in this species is 3, but with your help fighting off pesky cats the standard deviation of successfully raising additional chicks is 4. What is the probability that this population will be stable if you do your job fending off vicious bird eating cats?

the answer is 19.49%

i have included a link to the z table which you will need to use below, unfortunately it doesn't go all the way till 4 but you needn't go that far anyways. please help i don't know what i am doing here and i have tried numerous times. thanks

http://ucce.ucdavis.edu/files/repository/calag/tab4605p15.jpg

Explanation / Answer

nvm i got it

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