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UPSC ISS (Statistical Service) Statistics — practice by topic

Browse 29 questions across 3 Statistics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Statistics topics

Probability (29)Quantitative Aptitude (29)Statistics (29)

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An analyst measures how certain an outcome of a repeated activity is. That measure is called:Read the answer and worked solution →A die is rolled once. The set containing 1, 2, 3, 4, 5 and 6 is called the:Read the answer and worked solution →Probabilities cannot take just any value. Every probability lies between:Read the answer and worked solution →A fair coin is flipped 20,000 times and heads comes up close to half the time. That result illustrates that probability is the long-term:Read the answer and worked solution →

Worked practice questions

An analyst measures how certain an outcome of a repeated activity is. That measure is called:

  1. Probability
  2. Popularity
  3. Proportion
  4. Perimeter
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Correct answer: A. Probability

1. The activity can be repeated many times. 2. What is being quantified is how sure we are of each outcome. 3. That measure is probability. _Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._

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A die is rolled once. The set containing 1, 2, 3, 4, 5 and 6 is called the:

  1. Standard scale
  2. Sample space
  3. Sample survey
  4. Simple series
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Correct answer: B. Sample space

1. Every result the roll could give is listed once. 2. Nothing outside that list can happen. 3. That complete list is the sample space. _Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._

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Probabilities cannot take just any value. Every probability lies between:

  1. Zero and one
  2. One and ten
  3. Minus one, one
  4. Zero and ninety
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Correct answer: A. Zero and one

1. An impossible outcome gets the smallest value. 2. A certain outcome gets the largest. 3. So every probability lies between zero and one inclusive. _Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._

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