Independent work RFEI Mathematics 4 15 job

Independent work number 4 Mathematics 15 mission.
Answers to 15 job, in the form of a table.
A separate file contains all tasks.
Tasks for comparison:

Problem 1. On a shelf enclosed shopping center 6 packs of markers of different colors. How many color combinations can make of them, if the package of markers spread in a line?
A) 720; B) 24; B) 60.
Task 2. How many permutations of the letters of the word "business" in which the letter "b" in the first place, and the letter "c" - at the end of words?
A) 120; B) 24; B) 60.
Problem 3. What three-letter "words" can be formed from the letters of the word "accounting"? A word is any sequence of letters.
A) 10; B) 24; B) 60.
Problem 4. In how many ways can sit 6 participants at the round table?
A) 120; B) 15; B) 30.
Task 5: two hundred respondents were asked: "^^ VUT Do you have pets at home?". Eighty-four people responded positively. What is the relative frequency of a positive response in this experiment?
A) 0.84; B) 0.42; B) 0.16.
Problem 6. Of the proposed exam in math 100 questions a student has learned 75 questions. What is the probability that a student will get the exam question that he learned?
A) 0.75; B) 0.25; B) 0.34.
Task 7. The shopping the supermarket shelf are 20 packs of butter. Of these, 13 packs of chocolate butter, 7 packs of butter "Peasant". What is the probability of randomly take off the shelf a stack of butter "Peasant"?

...

Problem 15. Find the expected number of defective cars from the 1000 cars are on the Kursk station, if each car may be defective with probability 0.03.
A) M (X) = 10; B) M (X) = 30; B) M (X) = 100.