Write a recursive definition for the number of possible binary trees that have distinct shapes and contain n nodes.

ENGR 121 11/21/2016 Spencer Kociba ● Statistics ○ Mean ■ Average of numbers ○ Standard deviation and variance ■ 2 ways of determining the spread of data ○ mode(x) ■ Identifies the most frequently occurring value ○ sort(x) ■ Sorts vector from minimum value to max value ○ median(x) ■ Finds the middle number in a vector ■ Note: to find the median of a set of data, sort it first then use the median function ○ Median Filtering ■ Size of a median filter is calculating the median of every n values in that size ■ function medFiltVec = medianNFilte