[求助]一道简单的零件加工问题
<p class="MsoNormal" style="text-indent: 21pt;"><span style="font-family: 宋体;">某车间要加工</span><span lang="EN-US">5</span><span style="font-family: 宋体;">种不同类型的零件，零件每次只到达</span><span lang="EN-US">1</span><span style="font-family: 宋体;">个，其到达间隔时间服从参数等于</span><span lang="EN-US">25</span><span style="font-family: 宋体;">分钟的指数分布，零件到达加工点的规律如：</span></p><table cellspacing="0" cellpadding="0" border="1" class="MsoTableGrid" style="border: medium none ; border-collapse: collapse;">
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<p class="MsoNormal"><span style="font-family: 宋体;">零件类型</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">1</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">2</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">3</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">4</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">5</span></p>
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<td width="95" valign="top" style="border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; border-width: medium 1pt 1pt; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span style="font-family: 宋体;">概率</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">0.10</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">0.25</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">0.22</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">0.28</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">0.15</span></p>
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<p class="MsoNormal" style="text-indent: 21pt;"><span style="font-family: 宋体;">零件可在三台相同类型的机器上进行加工，如果三台机器均不空，则排队等候；若有一台机器有空，则立即进行加工，每种零件的加工时间如下表：</span></p>
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<td width="115" valign="top" style="border: 1pt solid windowtext; padding: 0cm 5.4pt; width: 86.4pt;">
<p class="MsoNormal"><span style="font-family: 宋体;">零件类型</span></p>
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<td width="74" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 55.6pt;">
<p class="MsoNormal"><span lang="EN-US">1</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">2</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">3</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">4</span></p>
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<td width="95" valign="top" style="border-style: solid solid solid none; border-color: windowtext windowtext windowtext -moz-use-text-color; border-width: 1pt 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">5</span></p>
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<td width="115" valign="top" style="border-style: none solid solid; border-color: -moz-use-text-color windowtext windowtext; border-width: medium 1pt 1pt; padding: 0cm 5.4pt; width: 86.4pt;">
<p class="MsoNormal"><span style="font-family: 宋体;">加工时间（分钟）</span></p>
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<td width="74" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 55.6pt;">
<p class="MsoNormal"><span lang="EN-US">50</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">55</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71pt;">
<p class="MsoNormal"><span lang="EN-US">60</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">65</span></p>
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<td width="95" valign="top" style="border-style: none solid solid none; border-color: -moz-use-text-color windowtext windowtext -moz-use-text-color; border-width: medium 1pt 1pt medium; padding: 0cm 5.4pt; width: 71.05pt;">
<p class="MsoNormal"><span lang="EN-US">70</span></p>
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<p class="MsoNormal" style="text-indent: 21pt;"><span style="font-family: 宋体;">假设共有</span><span lang="EN-US">500</span><span style="font-family: 宋体;">个零件需要进行加工，试计算加工完这些零件需要用的平均时间。</span></p>
<p class="MsoNormal" style="text-indent: 21pt;"><span lang="EN-US"><op>
</op></span></p>
麻烦各位高手帮忙解答一下哦，在此拜谢
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