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# GMAT Prep - Math

### Statistics

Mode - Middle term in a set of numbers arranged in numerical order
Mode - The number that appears the most in a set
Range - Positive difference between the largest and smallest terms in a set
True or false - In a sequence of consecutive or evenly spaced integers, the average DOES NOT equal the median. False
What's the formula for finding the number of terms in a sequence of consecutive integers? (Largest - Smallest)+1
If one wants to find the number of terms in a sequence of multiple of 4 between smallest and largest, one calculates using what formula? (Largest-Smallest)/4 +1
Average formula = (largest + Smallest)/2
If one wants to find the average of a sequence of multiples of 4 between 13 and 29.... (28 + 16)/2
Combination - Gives the number of unordered subgroups of k items that can be selected from a group of n different items. n!/k!(n-k)!
Permutation - Gives the number of ordered subgroups of k items that can be made from a group of n different items. n!/(n-k)!
True or false - For permutation, order DOES matter, while in combination, order DOES NOT matter. True
Probability formula = (# of desired outcomes)/(# of possible outcomes)
If the outcome of one event doesn't affect the probability of another, then it is __________ event. Independent
If the outcome of one event does affect the probability of another, then it is _________ event Dependent
To determine the probability of a non-mutually exclusive event, one uses the formula: P(A) + P(B) - P(A&B)
To determine the probability of a mutually exclusive event (Both events cannot occur at the same time), then one uses the formula: P(A) + P(B)
Standard deviation - Dispersion of the set of numbers around the mean.
Multiply SD by a whole number - Set numbers get spread out
Multiply SD by a fraction - Set numbers get closer together
Created by: U0105006