Предмет: Математика, автор: феталь

стрельбу в цель ведут 12 солдат . Для пяти из них вероятность попадания 0,6,для трёх 0,5 и для остальных 0,8 . Какова вероятность поражения цели

Ответы

Автор ответа: 4MD
0

В данном случае проще из 1 вычесть вероятность того, что цель поражена не будет.
<var>1-(1-0,6)^{5}</var> cdot <var>(1-0,5)^{3}</var> cdot <var>(1-0,8)^{12-5-3}=</var><var>1-0,4^{5}</var> cdot <var>0,5^{3}</var> cdot <var>0,2^{4}</var>=<var>1-0,01024</var> cdot <var>0,125</var> cdot <var>0,0016=</var>1-0,000002048=0,999997952
Максимально точный ответ:  0,999997952

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ПОМОГИТЕ, ОЧЕНЬ НАДО, ПОЖАЛУЙСТА!!!!!
Study the definition of an economist and decide which word A, B, C or D from the table below best fits each gap:
1. A relationship B factors C membership D dependence
2. A commodities B conditions C communities D criteria
3. A shake B shape C sharpen D shrink
4. A allocations B accomplishments C arrangements D agreements
5. A carrier B caterer C career D currier
6. A roundly B randomly C rarely D roughly
7. A exploited B employed C exported D endowed
8. A reductions B requirements C restrictions D revisions
9. A hold B keep C make D fit
10. A demand B decrease C decline D develop

An economist is an expert who studies the 1 ____________ between a society’s resources and its production or output. The societies studied may range from the smallest of local 2 ____________ to an entire nation or even the global economy.
The expert opinions and research findings of an economist are used to help
3 ____________ a wide variety of policies, including interest rates, tax laws, employment programs, international trade 4____________and corporate strategies.
There is a good chance that someone interested in a 5_______________ as an economist will work for the government. According to the Bureau of Labor Statistics, 6______________ 50% of all economists work for either a federal or state agency. The rest are 7______________ as professors, by corporations or as part of economic think tanks.
A career as an economist has two main 8_______________. First, economists generally 9______________ advanced degrees, such as a PhD or a master’s degree. Second, economists typically 10 _______________ an area of specialization where they focus their research efforts.