Question 148Asked in BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam)

What is the second moment about the origin for a random variable X with probability density?निम्न संभाव्यता घनत्व वाले यादृच्छिक चर X के मूल के बारे में दूसरा आघूर्ण क्या है?

What is the second moment about the origin for a random variable X with probability density? f(x) = x/2, 0 < x < 2; 0 otherwise
निम्न संभाव्यता घनत्व वाले यादृच्छिक चर X के मूल के बारे में दूसरा आघूर्ण क्या है? f(x) = x/2, 0 < x < 2; अन्यथा 0
  1. A22
  2. B33
  3. C44
  4. DMore than one of the aboveउपर्युक्त में से एक से अधिक
  5. ENone of the aboveउपर्युक्त में से कोई नहीं
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Correct answer: (A) 22

Explanation

E[X²] = ∫₀² x² · (x/2) dx = (1/2)(2⁴/4) = 2.E[X²] = ∫₀² x² · (x/2) dx = (1/2)(2⁴/4) = 2।

From BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper

This is question 148 of BPSC TRE 2.0 (2023) Mathematics Class 9-10 (Re-exam) — Previous Year Paper. See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.