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Distinguish between discrete and continuous random variables.

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प्रश्न

Distinguish between discrete and continuous random variables.

फरक स्पष्ट करा
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उत्तर

  Points of Difference Discrete Variable Continuous Variable
1. Meaning A variable which can take only certain specific values. A variable which can take any value within a given range or limit.
2. Nature of Values Its values increase in jumps or steps (whole numbers). Its values increase continuously, not in jumps or steps.
3. Example Number of students in a class – 30, 35, 40, 45, 50. Height, weight, or age – e.g., 50.5 kg, 42.8 kg, 18.6 years.
4. Probability Distributions Binomial, Poisson, and hypergeometric distributions belong to this category. Normal, Student’s t, and Chi-square distributions belong to this category.
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Random Variable
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Random Variable and Mathematical expectation - Exercise 6.1 [पृष्ठ १३३]

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सामाचीर कलवी Business Mathematics and Statistics [English] Class 12 TN Board
पाठ 6 Random Variable and Mathematical expectation
Exercise 6.1 | Q 16 | पृष्ठ १३३

संबंधित प्रश्‍न

Suppose X is the number of tails occurred when three fair coins are tossed once simultaneously. Find the values of the random variable X and number of points in its inverse images


The distribution of a continuous random variable X in range (– 3, 3) is given by p.d.f.
f(x) = `{{:(1/16(3 + x)^2",", - 3 ≤ x ≤ - 1),(1/16(6 - 2x^2)",", - 1 ≤ x ≤ 1),(1/16(3 - x)^2",", 1 ≤ x ≤ 3):}`
Verify that the area under the curve is unity.


Suppose that the time in minutes that a person has to wait at a certain station for a train is found to be a random phenomenon with a probability function specified by the distribution function

F(x) = `{{:(0",",  "for"  x ≤ 0),(x/2",",  "for"  0 ≤ x < 1),(1/2",",  "for" ≤ x < 2),(x/4",",  "for"  2 ≤ x < 4),(1",",  "for"  x ≥ 4):}` 
Is the distribution function continuous? If so, give its probability density function?


Define dicrete random Variable


Explain the distribution function of a random variable


Choose the correct alternative:

A variable that can assume any possible value between two points is called


Choose the correct alternative:

A formula or equation used to represent the probability distribution of a continuous random variable is called


Let X be a random variable with a cumulative distribution function.
F(x) = `{{:(0",",  "if"  x  < 0),(x/8",",  "if"  0 ≤ x ≤ 1),(1/4 + x/8",",  "if"  1 ≤ x ≤ 2),(3/4 + x/12",",  "if"  2 ≤ x < 3),(1",",  "for"  3 ≤ x):}`
Compute: (i) P(1 ≤ X ≤ 2) and (ii) P(X = 3)


The p.d.f. of X is defined as
f(x) = `{{:("k"",",  "for"  0 < x ≤ 4),(0",",  "otherwise"):}`
Find the value of k and also find P(2 ≤ X ≤ 4)


The probability density function of a continuous random variable X is
f(x) = `{{:(a + bx^2",",  0 ≤ x ≤ 1),(0",",  "otherwise"):}`
where a and b are some constants. Find Var(X)


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