# Statistics & Combinatorics

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1. When 2 sets with same median are combined, the median of the new set will remain the same
2. In evenly spaced set, the median equals mean
3. To find the number of terms within a range , inclusive of end points
((first -last)/frequency) +1
4. Standard deviation is the measure of the dispersion around the mean.
5. If two sets have the same number of terms then the one that is more spaced will have greater SD
6. If in 2 sets with equally spaced numbers, the one that has greater number of terms has greater SD.
7. Standard deviation can never be negative. If SD is 0 then there is no deviation
8. Combinations formula
n!/k!(n-k)!
9. Probability of events occuring
#of successful events/# of possible outcomes
10. Probability of atleast one outcome
1- P(no outcome)
11. P(A or B) = P(A) + P(B) - P(A and B)
12. Permutations
n!/(n-k)!
13. When determining the no. of arrangements in a counting problem always multiply
 Author: Neeharika ID: 223498 Card Set: Statistics & Combinatorics Updated: 2013-06-12 03:10:50 Tags: Stats perm comb prob Folders: Description: Statistics, Permutations,Combinations,Probability Show Answers: