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最新電大應(yīng)用概率統(tǒng)計(jì)試題考試小抄(參考版)

2025-06-07 02:00本頁面
  

【正文】 an. Lou held a joint interview with 27 media, including China Daily, the first in a series of interviews entitled Chinese Media Along the Silk Road. The interviews will be in Shaanxi and Gansu provinces and the Xinjiang Uygur autonomous region, as well as Kazakhstan, Uzbekistan and Turkey. The media group held the first interview on Wednesday morning in Xi39。s public security bure au shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2021. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, which will strengthen China39。s ancient indigenous religion, while Du jiang yan is considered to be the oldest functioning watercontrol project in the world. Chengdu ranked third in tourist facilities, management and services among 60 Chinese cities in a customer satisfaction survey released last year. But, Li added that efforts are still needed to develop more tourism products, improve English services and provide accurate translation of traffic signs and scenic billboards. Zhao Yun, chairwoman of British Chamber of Commerce Southwest China, told China Daily that his colleagues found the policy very co nvenient. A British client once flew here and stayed for just one day to check her ordered goods, she said. Zhao was born in Shanxi province, but she has lived in Chengdu for more than 10 years. My life was like a running race moving from place to place. I also lived in Beijing and Shanghai before, she said. But Chengdu is a place that you never want to leave once settling down. It is now my second hometown, she said. If the environment is further improved, the city will attract more people to visit and live, with the 72hour visafree policy and pelling conditions in transportation, culture, climate and cuisine, he said. Foreigners also gave positive feedback on the policy. A spokesman from Dell Inc said the pany has a global hub of operation in Chengdu, so the threeday visa has an immediate and positive influence on the pany39。s level of internationalization. The policy will also bring direct economic revenue, Li said. Chengdu has many cultu ral legacies and is also a paradise for panda lovers with the world39。1 1.xF x a b x xx????? ? ? ? ????? , ① 試確定常數(shù) ,ab; ② 求 1{ 1 }2PX? ? ?; ③ 求 X 的密度函數(shù).( 10 分) 3. 若從 10 件正品、 2 件次品的一批產(chǎn)品中,無放回地抽取 2 次,每次取一個,試求第二次取出次品的概率. ( 6 分) 4.設(shè) X 的密度函數(shù)為 1( ) , ( , )2 xf x e x?? ? ? ? ? ?. ① 求 X 的數(shù)學(xué)期望 EX 和方差 DX ; ② 求 X 與 X 的協(xié)方差和相關(guān)系數(shù),并討論 X 與 X 是否相關(guān). ( 8 分) 5.設(shè)二維隨機(jī)變量 ),( YX 在區(qū)域 D 上服從均勻分布,其中 D 是由曲線 2yx? 和直線 yx? 所圍成.試求 ( , )XY 的聯(lián)合分布密度及關(guān)于 ,XY的邊緣分布密度 )(xfX 與 )(yfY ,并判斷 ,XY是否相互獨(dú)立.( 10 分) 6.設(shè)隨機(jī)變量 X 服從區(qū)間 ],[ ba 上的均勻分布,試證明: cXY ?? ( c 為常數(shù))也服從均勻分布. ( 8 分) 四、應(yīng)用題: 以下是某農(nóng)作物對三種土壤 1 2 3,A A A ,兩種肥
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