December 9, 2019 - Articles, BlogZ-score introduction | Modeling data distributions | AP Statistics | Khan Academy

A brain cultivating lecture from an expert, though an effortlessly making math easy mathematician. Brilliant Reply

Sal forgot to subtract 1 from the number of data points, resulting in an incorrect standard deviation of approximately 1.69–√(20÷7). The correct standard deviation is approximately 1.83–√(20÷6). Reply

Ah! a classic math video from my main man Mr.Khan

lol this was made during the algebra 2 regents today

A brain cultivating lecture from an expert, though an effortlessly making math easy mathematician. Brilliant

Standard deviation is supposed to be 1.82 isn’t it? n-1? 7-6? Or am I missing something?

Sal forgot to subtract 1 from the number of data points, resulting in an incorrect standard deviation of approximately 1.69–√(20÷7). The correct standard deviation is approximately 1.83–√(20÷6).

thank

😂😂 wellcome

Why do we need z score ?