Question 1) Birthday paradox: Given N people, calculate the probability that at least two people have their birthday in the same month. 1) when N = 4; 2) when N = 14.
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Question 1) Birthday paradox: Given N people, calculate the probability that at least two people have their birthday in the same month.
1) when N = 4;
2) when N = 14.
Question 2) Digital forensics: Suppose that we a record but not sure which one is the original one and which one has been modified:
A) Bob leaves the hotel at 7:00 pm
B) Bob leaves the hotel at 6:00 pm
Fortunately, we have the hash value of the original record, calculated by SHA-256:
2655a8151189efae706db96460d368ab6adb9f5a1b88e5aa5c6ea18ba65beadd
Please tell which one is the original one, A or B?
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