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【简答题】
Suppose Z is standard normal distributed, please find out P(-1.45 < Z < 2.10) = (1 ) ; P(Z (2) .(精确到小数点后4位) Let t 0 be a specific value of t, please find out P(t>t 0 )=0.025 (where df=11)= (3) ; P(t>t 0 )=0.01 (where df=9)= (4) .(精确到小数点后三位)
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【单选题】Recently，these companies have ________ some workers becames of the drop in economy.
A.
hired
B.
dismissed
C.
refused
D.
employed
【简答题】The case of Schutt helmet demonstrated that recently some injury claims ______ .
【单选题】Recently, these companies have _____ some workers because of the drop in economy.
A.
hired
B.
dismissed
C.
refused
D.
employed