@@37的狗 YES! remove median,data會more dispersed(分散),所以standard deviation increases insert a data in the middle,data會less dispersed (集中),所以standard deviation decreases 除非所有數據相等,standard deviation就永遠都係0,insert/remove median都唔會改變
@user-pv9yv7nc3o6 ай бұрын
@@frankiemak9590唔係remove mean先係咩?median同SD都冇關係
@frankiemak95906 ай бұрын
@@user-pv9yv7nc3o 假設唔係所有data一樣 (sd ≠ 0) 的話 Remove mean,sd increases,呢個一定啱,大家亦都應該要識得prove 至於點解remove median,sd increases,就需要啲啲大學嘅stat知識先prove到了,可以參考dse practice paper paper 2 Q45,考評局都印證咗係啱的
MC好大機會考,i次方就算好大都要識處理,然後都係溫返三種基本題型 1. (m+ni) / (p+qi) 變成 a+bi 嘅form 2. a+bi is a real number (實數) / is an imaginary number (虛數) 3. a + bi = c + di , 利用compare coefficients of like terms (比較同類項的係數) 搵返unknowns LQ可能考,雖然機會不大,考的話都係溝quadratic eq(二次方程)