Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.
已知离散型随机变量X的概率分布为
X10203040
P0.20.10.5a
(1)求常数a;(2)求X的数学期望EX.
Shehadclearlyno________ofdoinganywork,althoughshewasverywellpaid.
Ifyouwanttofindadecentlocationforyourownhome,________Mr.Smithforadvice.
设A为三阶矩阵,P为可逆矩阵,使得P-1AP=012
