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## A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

student : Given that 2.84% of the population is allergic to flu shots, and 10 randomly selected members are chosen, what is the probability that none of the chosen are allergic to flu shots?
tutor3 : Please wait, we are helping other students
student : Okay.
tutor3 : suvo chatterjee.am from india and yours
student : Geoff
student : Johnson
tutor3 : hi,please wait a while sorry ..will be back to you asap
student : okay
tutor3 : yeah its almost done
student : Okay
tutor3 : oh its .9 then the answer
tutor3 : sorry wasnt meant for you
student : yeah i didn't think so
tutor3 : bye
student : Wait, you didn't answer my question
tutor3 : i know.there is some problem going on i guess again the last one wasnt for you but it just went.just hold on. let me fix it
tutor3 : am answeing your ques in short while
student : Okay, thanks.
tutor3 : lets take the population to be 100 then 2.84 people out of that are allergic which means 2.84/100=.0284 is the probability of a person having allergy. so the probability that a person will not have allergy is 1- .0284=.9714
tutor3 : 97%
student : So there is a 97% chance that nobody out of the ten selected will have a disease?
tutor3 : yes
student : What if 4 people out of the 10 have it?
tutor3 : the probabilty of having allergy of the 10 individuals is very low so we can reject that
student : But how would I calculate that low probability?
tutor3 : ok do one thing Fax your homework to 206-339-8302. or, email to *****@aafter.com. Include your email and phone number.
student : ok thanks
tutor3 : to calculate the low probability you have .9714 as your favourable case and C(100,10) as your total choices .so the probality is .9714/C(100,10)= very low a term.hence your answer
tutor3 : do you have more questions other than this one?
student : No, I think that will do it
student : thanks

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