Officials also warned that the number is expected to rise.
官员们警告称,预计这一数字还会上升。
单词 | Expected number |
释义 |
Expected number
原声例句
VOA Special 2022年6月合集 Officials also warned that the number is expected to rise. 官员们警告称,预计这一数字还会上升。 BBC 听力 2015年9月合集 The UNHCR regional coordinator V announced the expected migrant numbers at a press conference in Budapest. 在布达佩斯召开的新闻发布会上,联合国难民署地区协调员就难民人数做出了回应。 精选英语短文 In cholera endemic countries an outbreak can be seasonal or sporadic and represents a greater than expected number of cases. 在霍乱流行国家,爆发可能是季节性或散发的,病例数量超过预期。 CNN 听力 2018年10月合集 In total, the disaster left at least 70,000 homeless, though that number is expected to increase as rescuers come through the rubble. 这场灾害共造成至少7万人流离失所,超过1400人死亡,不过死亡人数可能继续增加,因为救援人员仍在废墟中搜寻。 可汗学院:统计学(视频版) So what was the expected number on Monday? 那么周一的预期数字是多少? 可汗学院:统计学(视频版) So let's just figure out how we can get the expected number. 因此,让我们弄清楚如何获得预期的数字。 TED演讲(视频版) 2023年8月合集 Now, just three years later, that number is expected to increase to 350 gigawatts per year. 现在,仅仅三年后,这个数字预计将增加到每年 350 吉瓦。 可汗学院:统计学(视频版) We know that the expected number of baskets I make after 10 shots. 我们知道我投篮 10 次后的预期投篮数。 可汗学院:统计学(视频版) It's not worse because you would have expected a small number, and a lot of people got sick here. 这并不更糟,因为你会预料到人数很少,而且很多人在这里生病了。 可汗学院:统计学(视频版) That's the expected number of cars in an hour divided by number seconds in an hour. 这是一个小时内预期的汽车数量除以一小时内的秒数。 VOA Special 2014年9月合集 Doctor Frieden says the number of Ebola cases is now more than 3,000. He adds that this number is expected to rise quickly in coming weeks. 弗里登博士说,埃博拉病例现在已达到3000多个,他说未来几周这个数字有望快速增加。 VOA Standard 2013年7月合集 Despite better than expected job numbers, the nation’s unemployment rate remained unchanged at 7.6 percent as more Americans resumed their job search. 尽管就业人数好于预期, 但随着越来越多的美国人恢复求职, 美国的失业率仍保持在 7. 6% 不变。 VOA Special 2022年10月合集 The race to slow the progression of Alzheimer's comes as the number of Americans living with the disease is expected to double to 13 million by 2050, the Alzheimer's Association said. 阿尔茨海默病协会表示,在竞相减缓阿尔茨海默病患者的疾病过程的同时,到2050年,美国患有阿尔茨海默病的人数预计将会翻一番,达到1300万人。 CNN 10 学生英语 2018年10月合集 In total, the disaster left at least 70,000 homeless, and it killed more than 1,400, though that number is expected to increase as rescuers come through the rubble. 这场灾难总共造成至少 70,000 人无家可归,并造成 1,400 多人死亡, 不过随着救援人员从废墟中赶来, 这一数字预计还会增加。 China Daily 最新合辑 The projected fertility rate, or the expected number of children born per woman during child-bearing years, was at 1.36 for 2070, slightly up from 1.33 in 2020 but remaining well below the 2.07 level required to maintain the population. 2070 年的预计生育率,即每名妇女在其育龄期生育的预期子女数,为 1.36,略高于 2020 年的 1.33,但仍远低于维持人口数量的门槛 2.07。 可汗学院:统计学(视频版) And so we can use this population sample-- or I shouldn't call it the population-- we should use this sample right here to figure out the expected number of people who would get sick or not sick. 所以我们可以使用这个人口样本——或者我不应该称之为人口——我们应该在这里使用这个样本来计算出预计会生病或不会生病的人数。 高中英语人教版第三册听力 There is so much enthusiasm for winter sports in China that the number of people taking part is expected to grow by ten to twenty times in just five years, reaching between 50 and 100 million by 2009. 中国对冬季运动的热情如此之高,预计参加人数将在短短五年内增长十至二十倍,到 2009 年将达到 50 至 1 亿。 可汗学院:统计学(视频版) So we know that the expected number of baskets I make after 10 shots, where each of my shots is 40%-- all I have to do is multiply the probability times the number of baskets I'm taking. 所以我们知道我在 10 次投篮后的预期投篮数,我每次投篮的命中率为 40%——我所要做的就是将概率乘以我的投篮数。
中文百科
期望值 Expected value(重定向自Expected number)
在概率论和统计学中,一个离散性随机变量的期望值(或数学期望、或均值,亦简称期望,物理学中称为期待值)是试验中每次可能结果的概率乘以其结果的总和。换句话说,期望值是随机试验在同样的机会下重复多次的结果计算出的等同“期望”的平均值。需要注意的是,期望值并不一定等同于常识中的“期望”——“期望值”也许与每一个结果都不相等。(换句话说,期望值是该变量输出值的平均数。期望值并不一定包含于变量的输出值集合里。) 例如,掷一枚六面骰子,其点数的期望值是3.5,计算如下: 3.5不属于可能结果中的任一个。 赌博是期望值的一种常见应用。例如,美国的轮盘中常用的轮盘上有38个数字,每一个数字被选中的概率都是相等的。赌注一般押在其中某一个数字上,如果轮盘的输出值和这个数字相等,那幺下赌者可以将相当于赌注35倍的奖金(原注不包含在内),若输出值和下压数字不同,则赌注就输掉了。因此,考虑到38种所有的可能结果,以1美元赌注押一个数字上获利的期望值为:
英语百科
Expected value 期望值(重定向自Expected number)
![]() ![]() In probability theory, the expected value of a random variable, intuitively, is the long-run average value of repetitions of the experiment it represents. For example, the expected value in rolling a six-sided die is 3.5 because, roughly speaking, the average of all the numbers that come up in an extremely large number of rolls is very nearly always quite close to three and a half. Less roughly, the law of large numbers states that the arithmetic mean of the values almost surely converges to the expected value as the number of repetitions approaches infinity. The expected value is also known as the expectation, mathematical expectation, EV, average, mean value, mean, or first moment. |
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