Test
120-140
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Preguntas del test (16)
1Assuming that the height of men of a certain age group is a normally distributed random variable X with the parameters α=173, σ^2=36. Find the correctly calculated probabilities of the events.
- AP(176;182)=0.1348
- BP(20;30)=10/30
- C
- DP(|X-173|)<=3)=2Ф(1/2)
- EP(10;50)=0.2417
2Assuming that the height of men of a certain age group is a random variable X uniformly distributed over (0;10) . Find the correctly calculated probabilities of the events.
- AP(3<X<8)=0.18
- BP(X<3)=0.3
- CP(5<X<10)=1/3
- DP(0;10)=1/4
- EP(1;5)=0.17
3Assuming that the height of men of a certain age group is a random variable X uniformly distributed over (0;10) . Find the correctly calculated probabilities of the events.
- AP(3<X<8)=0.18
- BP(5<X<10)=1/3
- CP(0;10)=1/4
- DP(X>6)=0.4
- EP(1;5)=0.17
4question
- Aa=1
- BD(X)=4
- CP(-1;3)=0.32
- Da= - 1
- Ep(1;5)=Ф(2/5)-Ф((1-2)/2)
5124. The time (in hours) required to repair a machine is an exponentially distributed random variable with parameter γ. Find the correctly calculated probabilities of the events.
- A
- B
- C
- D
- E
- A
6.
- A
- B
- C
- D
- A
7How many ways are there to choose 2 details from a box containing 9 details?
- A12
- B4
- C22
- D11
- E36
8If some object A can be chosen from the set of objects by m ways, and another object B can be chosen by n ways, then we can choose either A or B by … ways.
- Am+n
- Bm-n
- Cn-m
- Dn!
9Events are equally possible if …
- Anone of them will necessarily happen as a result of a trial
- Bthere is reason to consider that none of them is more possible (probable) than other
- Cthere is reason to consider that one of them is more possible (probable) than other
- Dat least one of them will necessarily happen as a result of a trial
- Eone of them will necessarily happen as a result of a trial
10The probability of a reliable event is equal to …
- A1
- B0
- C1/2
- D1/3
- E1/5
11The probability of an impossible event is equal to …
- A0
- B1
- C1/3
- D1/2
- E1/5
12The probability of a random event is …
- Athe positive number between 0 and 1
- Bthe positive number between 0 and ½
- Cthe positive number between 0 and 10
- Dthe positive number between 0 and 1/3
- Ethe positive number between 0 and 1/5
13At shooting by a rifle the relative frequency of hit in a target has appeared equal to 0,4. Find the number of hits if 20 shots were made.
- A8
- B3
- C20
- D1
- E6
14Two dice are tossed. Find the probability that different number of aces will appear on dices
- A1/6
- B5/6
- C1/2
- D1/3
- E1
15Two dice are tossed. Find the probability that the sum of aces will exceed 10.
- A1/12
- B5/12
- C5/18
- D1/18
- E0
16Three students pass an exam. The probability that the exam will be passed on "excellent" by the first student is equal to 0,5; by the second – 0,2; and by the third – 0,8. What is the probability that the exam will be passed on "excellent" by only one student?
- A0.42
- B0.48
- C0.92
- D0.28
- E0.99
Información
- Descripción
- Test sobre 120-140, creado por Dimas Dima el 28/12/2019.
- Autor
- Dimas Dima
- Idioma
- English
- Visitas
- 32
- Valoración
- Aún sin valoraciones Valora este test