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Задать вопрос экспертам

Консультация № 178209

04.05.2010, 23:01

0.00 руб.

0 2 0

Образование

Уважаемые эксперты, помогите пожалуйста решить следующие воросы (нуждаюсь в срочном ответе):

Уважаемые эксперты, помогите пожалуйста решить следующие воросы (нуждаюсь в срочном ответе):

1. Задан вид плотности распределения f(x) случайной величины Х. Найти а, функцию распределения F(x), математическое ожидание M(x), дисперсию D(x), среднеквадратическое отклонение бх и вероятность P(x>b).
_f(x)=a(x-2)(1(x-2)-1(x-4))+a(6-x)(1(x-4)-1(x-6)); b=2.8
_f(x)=acos в квадрате x(1(x+пи/2)-1(x-пи/2)) b=пи/4

решая задачу, я пришла к вычислению след. суммы
[$8747$](от 4 до 2) a(x-2)dx+[$8747$](от 6 до 4) a(6-x)dx=1
помогите пожалуйста вычислить сумму и найти мат. ожидание.

2. Расстояние до цели измеряется прибором, для которого срединное отклонение равно M1. Считая вычисленное расстояние НСВ с нормальным распределением, МО которой равно истинному расстоянию, определить вероятность события М2.
М1=50
М2:Δx<20

Обсуждение

давно

Практикант
187591
81

06.05.2010, 11:38

общий

В первой задаче как-то невнятно записано условие:
Можно понимать
a*(x-2)*(1/(x-2)-1/(x-4))+a(6-x)*(1/(x-4)-1/(x-6));
а можно
a/(x-2)*(1/(x-2)-1/(x-4))+a/(6-x)*(1/(x-4)-1/(x-6));
и еще десяток способов
уточните, пожалуйста.

Неизвестный

06.05.2010, 23:02

общий

как записано изначально-так и есть

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