阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    Not all memories are sweet. Some people spend all their lives trying to forget bad experiences.

    Now American researchers think they are close to developing a pill, ____ will help people forget bad memories. The pill is designed ____ (take) immediately after a frightening experience. They hope it might reduce, or ____ (possible) erase (抹去) the effect of painful memories.

    In November, experts tested a drug on people in the U.S. and France. The drug stops the body from ____ (release) chemicals that fix memories in the brain. So far, the research ____ (suggest) that only the emotional effects of memories may be reduced, not that memories are wiped out. They are not sure to the degree people's memories are affected.

    The research has caused a great deal of ____ (argue). Some think it is ____ bad idea, while others support it. Supporters say it could lead to pills which prevent or treat soldiers' troubling memories after war. They say that there are many people who suffer from terrible memories. ____, those who are____ the research say that maybe the pills can change people's memories and changing memories is very ____ (danger) because memories give us our identity.

（Ⅰ）据此样本，能否有99%的把握认为理科生报考“经济类”专业与性别有关？

（Ⅱ）若以样本中各事件的频率作为概率估计全市总体考生的报考情况，现从该市的全体考生（人数众多）中随机抽取3人，设3人中报考“经济类”专业的人数为随机变量X，求随机变量X的概率分布及数学期望．

附：参考数据：

（参考公式：X²= $\frac{n{\left(n_{11}{n}_{22}-n_{12}{n}_{21}\right)}^2}{n_1+n_2+n_{+1}{n}_{+2}}$ ）