已知E(X)=-1,D(X)=3,则E[3(X2-2)]=(). A: 9 B: 6 C: 30 D: 36
已知E(X)=-1,D(X)=3,则E[3(X2-2)]=(). A: 9 B: 6 C: 30 D: 36
30、40、50、60岁时戒烟可分别获得()的预期寿命。 A: 12、8、6、2 B: 10、8、6、2 C: 12、10、6、4 D: 10、9、6、3 E: 12、9、6、3
30、40、50、60岁时戒烟可分别获得()的预期寿命。 A: 12、8、6、2 B: 10、8、6、2 C: 12、10、6、4 D: 10、9、6、3 E: 12、9、6、3
-30除以9的余数是( ) A: -3 B: 6 C: 3 D: -6
-30除以9的余数是( ) A: -3 B: 6 C: 3 D: -6
健康牛嗳气次数(次/每小时)平均为 A: 1~3 B: 4~6 C: 9~11 D: 20~30 E: 30~50
健康牛嗳气次数(次/每小时)平均为 A: 1~3 B: 4~6 C: 9~11 D: 20~30 E: 30~50
30被9除的余数是( ) A: 3 B: 6 C: -3 D: -6
30被9除的余数是( ) A: 3 B: 6 C: -3 D: -6
M M 5 8 e ※???※() A: 田 田7 h 9 @ @ B: F f 3 2 g 红 ¥ ○ ¥ 红 C: D D 6 9 w ? + # # ? D: ∧ V 6 7 s ※ ? ? ? ※
M M 5 8 e ※???※() A: 田 田7 h 9 @ @ B: F f 3 2 g 红 ¥ ○ ¥ 红 C: D D 6 9 w ? + # # ? D: ∧ V 6 7 s ※ ? ? ? ※
下列时间,不适宜跟对方打电话的是( ) A: 6:30 B: 9:00 C: 15:00 D: 21:30 E: 13:00 F: 16:00
下列时间,不适宜跟对方打电话的是( ) A: 6:30 B: 9:00 C: 15:00 D: 21:30 E: 13:00 F: 16:00
已知E(X)=-1,D(X)=3,则E[3(X[sup]2[/]-2)]=( ). A: 9 B: 6 C: 30 D: 36
已知E(X)=-1,D(X)=3,则E[3(X[sup]2[/]-2)]=( ). A: 9 B: 6 C: 30 D: 36
If2<em>x</em>+3=9,whatis4<em>x</em>+6? A: 3 B: 4 C: 6 D: 9 E: 18
If2<em>x</em>+3=9,whatis4<em>x</em>+6? A: 3 B: 4 C: 6 D: 9 E: 18
M: When will the bank openW: It opens from 8:30 a.m. to 6:30 p.m. from Monday .to Friday, and it opens from 9:30 a.m. to 3:30 p.m. on Saturday and Sunday. When will the bank open on Sundays() A: From 8:30 a.m. to 8:30 p.m. B: From 9:30 a.m. to 6:30 p.m. C: From 8:30 a.m. to 6:30 p.m. D: From 9:30 a.m. to 3:30 p.m.
M: When will the bank openW: It opens from 8:30 a.m. to 6:30 p.m. from Monday .to Friday, and it opens from 9:30 a.m. to 3:30 p.m. on Saturday and Sunday. When will the bank open on Sundays() A: From 8:30 a.m. to 8:30 p.m. B: From 9:30 a.m. to 6:30 p.m. C: From 8:30 a.m. to 6:30 p.m. D: From 9:30 a.m. to 3:30 p.m.