概率分布与抽样分布3.1 事件及其概率3.2 随机变量及其概率分布3.3 大数定律与中心

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Laugh and cry. Having a good sob is reputed to be good for you. So is laughter, which has been shown to help heal bodies, as well as broken hearts. Studies in Japan indicate that laughter boosts the immune system and helps the body shake off allergic reactions.
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