CBSE Answers for MCQ 12 Science Maths Probability in English

Similar Questions from CBSE, 12th Science, Maths, Probability

Question 1 : A class has 15 students whose ages are 14, 17, 15, 14, 21, 17, 19, 20, 16, 18, 20, 17, 16, 19 and 20 years. One student is selected in such a manner that each has the same chance of being chosen and the age X of the selected student is recorded. What is the probability of the random variable X? Find the mean.   (View Answer Video)

Question 2 : A die is thrown 6 times. If 'getting an odd number' is a 'success', what is the probability of obtaining:
 exactly 5 successes?
  (View Answer Video)

Question 3 : Of the students in a college, it is known that 60% reside in hostel and 40% are day scholars (not residing in hostel). Previous year results report that 30% of all students who reside in hostel attain  'A' grade and 20% of day scholars attain 'A' grade in their annual examination. At the end of the year, one student is chosen at random from the college and he has an 'A' grade. What is the probability that the student is a hosteler?   (View Answer Video)

Question 4 :  In a group of 400 people, 160 are smokers and non-vegetarian, 100 are smokers and vegetarian and the remaining are non-smokers and vegetarian. The probabilities of getting a special chest disease are 35%, 20% and 10% respectively. A person is chosen from the group at random and is found to be suffering from the disease. What is the probability that the selected person is a smoker and non-vegetarian? What value is reflected in this question?     (View Answer Video)

Question 5 : A bag contains 4 red and 4 black balls, another bag contains 2 red and 6 black balls. One of the two bags is selected at random and two balls are drawn at random (without replacement) from the bag which are both found to be red. Find the probability that the balls are drawn from the first bag.    (View Answer Video)

Questions from Other Chapters of CBSE, 12th Science, Maths

Continuity and Differentiability

Question 1 : Differentiate  w.r.t.x. (View Answer Video)

Question 2 : Find the value of k, if the area of the triangle is 4 sq unit and vertices are (-2, 0), (0, 4), (0, k). (View Answer Video)

Question 3 : Differentiate the function w.r.t.x . (View Answer Video)

Question 4 : Differentiate the function w.r.t.x . (View Answer Video)

Question 5 : Differentiate the function  with respect to x. (View Answer Video)

Relations and Functions

Question 1 : If f is the greatest integer function and g is the modulus function . Write the value of g o f(-1/3) – f o g ( -1/3 ). (View Answer Video)

Question 2 : The function, f(x) = 2x + 1 is, (View Answer Video)

Question 3 : Let  be defined as . Choose the correct answer. (View Answer Video)

Question 4 :  be  defined as f(x) = (View Answer Video)

Question 5 :  * is a binary operation on Z such that: a * b = a + b + ab. The solution of (3* 4) *x = – 1 is,
  (View Answer Video)

Differential Equations

Question 1 : Find the general solution of differential equation  (View Answer Video)

Question 2 : If x cos(a + y) = cos y, then prove that  
Hence show that  (View Answer Video)

Question 3 : Write the degree of the differential equation :  (View Answer Video)

Question 4 : Show that the solution of differential equation :
(View Answer Video)

Question 5 : If y(x) is a solution of the differential equation   and y(0) = 1, then find the value of  (View Answer Video)