这道数据建模题怎么做?

Tzaihua

< ><B ><FONT size=3>题目<FONT face="Times New Roman">:<p></p></FONT></FONT></B></P>
< ><FONT size=3>某企业每年耗用某种材料<FONT face="Times New Roman">3650</FONT>件<FONT face="Times New Roman">,</FONT>每日平均耗用<FONT face="Times New Roman">10</FONT>件<FONT face="Times New Roman">,</FONT>一次订购费<FONT face="Times New Roman">25</FONT>元<FONT face="Times New Roman">,</FONT>每件年储存费<FONT face="Times New Roman">2</FONT>元<FONT face="Times New Roman">,</FONT>每件缺货一次费用<FONT face="Times New Roman">4</FONT>元<FONT face="Times New Roman">,</FONT>平均交货期<FONT face="Times New Roman">10</FONT>天<FONT face="Times New Roman">,</FONT>交货期内不同耗用量<FONT face="Times New Roman">X</FONT>的概率分布如下<FONT face="Times New Roman">:</FONT></FONT></P>
<TABLE  cellSpacing=0 cellPadding=0 border=1>

<TR >
<TD  vAlign=top width=50>
< ><B ><FONT face="Times New Roman">X<p></p></FONT></B></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">80</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">85</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">90</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">95</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><B ><FONT face="Times New Roman">100<p></p></FONT></B></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">105</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">110</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">115</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">120</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">125</FONT></P></TD>
<TD  vAlign=top width=46>
<P ><FONT face="Times New Roman">130</FONT></P></TD></TR>
<TR >
<TD  vAlign=top width=50>
<P ><B ><FONT face="Times New Roman">P<p></p></FONT></B></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">0.01</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">0.02</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">0.05</FONT></P></TD>
<TD  vAlign=top width=52>
<P ><FONT face="Times New Roman">0.15</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><B ><FONT face="Times New Roman">0.25<p></p></FONT></B></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0.20</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0.15</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0.10</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0.04</FONT></P></TD>
<TD  vAlign=top width=44>
<P ><FONT face="Times New Roman">0.02</FONT></P></TD>
<TD  vAlign=top width=46>
<P ><FONT face="Times New Roman">0.01</FONT></P></TD></TR></TABLE>
<P ><FONT size=3>求使平均费用达到最小的订货量<FONT face="Times New Roman">,</FONT>订购次数及含有保险储量的最佳订货点<FONT face="Times New Roman">.</FONT></FONT></P>