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When 2 sets with same median are combined, the median of the new set will remain the same

In evenly spaced set, the median equals mean

To find the number of terms within a range , inclusive of end points
((first last)/frequency) +1

Standard deviation is the measure of the dispersion around the mean.

If two sets have the same number of terms then the one that is more spaced will have greater SD

If in 2 sets with equally spaced numbers, the one that has greater number of terms has greater SD.

Standard deviation can never be negative. If SD is 0 then there is no deviation

Combinations formula
n!/k!(nk)!

Probability of events occuring
#of successful events/# of possible outcomes

Probability of atleast one outcome
1 P(no outcome)

P(A or B) = P(A) + P(B)  P(A and B)


When determining the no. of arrangements in a counting problem always multiply

