Study Note

Jhevon Smith Hi! I'm Jhevon, welcome to my YouTube channel. This channel is devoted to full length math lectures on a variety of subjects. The majority of the lectures are taught based on syllabi of the City College of New York, CUNY. Watch and learn and feel free to a www.youtube.com Professor Leonard This Channel is dedicated to quality mathematics education. It is absolutely FREE so Enjoy! Vi..

Sample mean: $\bar{x}$ $$ \bar{x}=\sum_{i=1}^{n}{x_i/n} $$ can often be simplified by noting that if for constant $a$ and $b$ $y_i=ax_i+b,\quad\quad i=1,\dots,n$ then the sample mean of the data set $y_1,\dots,y_n$ $\bar{y}=\sum_{i=1}^{n}{(ax_i+b)/n}=\sum_{i=1}^{n}{ax_i/n}+\sum_{i=1}^{n}{b/n}=a\bar{x}+b$ Weighted average $$ \bar{x}=\sum_{i=1}^{k}{v_if_i/n} $$ Sample median If $n$ is odd → the va..