確çå¤æ°ã«ãããæå¾ å¤ã®æä½ã¯åºæ¬ã§ãããæ··ä¹±ããããã®ã¯å¯¾è±¡ã¨ãªã£ã¦ããå¤æ°ã確çå¤æ°ãã©ããã§ãããå®æ°ãå¤æ°ãã®éãã§ã¯ãªãã確çå¤æ°ãé確çå¤æ°ãã®éããããæèãã¦æä½ããªããã°ãªããªãã以ä¸ã§ã¯ã大æåã¯ç¢ºçå¤æ°ãå°æåãé確çå¤æ°ã¨ãã¦ãããå½ç¶å®æ°ã¯é確çå¤æ°ã§ããã E(a)=a E(aX)=aE(X) E(X+Y)=E(X)+E(Y) E(XY)=E(X)E(Y)ââï¼Xã¨Yãç¬ç«ã®ã¨ãï¼ åæ£ãå ±åæ£ã«é¢ããå ¬å¼ãé常ã«éè¦ã§ãããV(X)ã¯ÏX2ã¨è¡¨è¨ããããã¨ãå¤ãã V(a)=0 V(aX)=a2V(X) V(X+a)=V(X) V(X+Y)=V(X)+V(Y)+2Cov(X,Y) V(X-Y)=V(X)+V(Y)-2Cov(X,Y) V(X+Y)=V(X)+V(Y)ââï¼Xã¨Yãç¬ç«ã®ã¨ãï¼ Cov(aX,bY)=ab
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