questions and answers 2026\2027 A+
Grade
Conditional Probability
- correct answer P(A and B)/P(B)
Counting
- correct answer # of outcomes in A/total # of outcomes
or
n!/k!(n-k)!
Combination Permientation
- correct answer (n choose k) n!/k!(n-k)!
Normal Distribution
- correct answer x-mean/standard deviation
Binomial Distribution
- correct answer (n choose k) x p^k x 1-p^n-k
mean= np
sd= square root of np(1-p)
Amount of Subsets
- correct answer 2^n