The probability of having blood type O is 0.4.
A doctor tests the blood type of 6 patients.
Assuming a binomial distribution, calculate the probability that exactly 2 of these patients have blood type O.
You may use (p+q)6=p6+6p5q+15p4q2+20p3q3+15p2q4+6pq5+q6(p + q)^6 = p^6 + 6p^5q + 15p^4q^2 + 20p^3q^3 + 15p^2q^4 + 6pq^5 + q^6(p+q)6=p6+6p5q+15p4q2+20p3q3+15p2q4+6pq5+q6.
Practise Edexcel GCSE Statistics The Binomial Distribution with exam-style questions for Foundation and Higher tier. 4 questions, matched to the Edexcel GCSE Statistics (1ST0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.