Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
Q2 is of Junior College standard. In fact, the binomial distribution is a chapter in Year 2 of Junior College under Statistics.

I have tried to explain the question in an easier format using just the binomial theorem, but I cannot guarantee that you will understand the idea (since this question is probably different from the other binomial questions which you have already attempted previously).