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Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
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.
设，则数列sn有界是数列an收敛的（）
Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.
Attendanceatfootballmatcheshave_____sincethecomingoftelevision.
