CS (Main) Exam 2021 Statistics Paper-I Question Paper PDF

Central Government Jobs Other Jobs 2021

  • Year 2021
  • Conducted By UPSC
  • Questions 8
  • Maximum Marks 250
  • Duration Three Hours
  • Languages English & Hindi

Exam Details

Detail Information
Examination CS (Main) Exam
Year 2021
Conducting Body UPSC
Paper Statistics Paper-I
Subject Statistics
Duration Three Hours
Maximum Marks 250
Number of Questions 8
Question Type Mixed

This is the official question paper for the CS (Main) Exam 2021, specifically Statistics Paper-I, conducted by UPSC. The paper carries a maximum of 250 marks and allows three hours for completion. It consists of eight questions divided into two sections, with compulsory questions 1 and 5. Candidates must attempt a total of five questions, ensuring at least one from each section. This paper is crucial for aspirants aiming to qualify for the Civil Services through the Main Examination, providing valuable insights into the statistical concepts and problem-solving approaches tested.

Major Topics Covered

  • Statistics
  • Probability
  • Estimation
  • Sampling
  • Insurance Policies
  • Set Theory
  • Conditional Probability

Why This Paper is Important

  • Useful for CS (Main) Exam preparation
  • Helps understand the latest exam pattern
  • Useful for practice and self-assessment
  • Covers frequently asked General Studies topics
  • Helpful for analysing question trends

Related Resources

  • CS (Main) Exam 2021 Statistics Paper-II
  • CS (Main) Exam 2020 Statistics Paper-I
  • CS (Main) Exam 2021 General Studies Paper-I
  • CS (Main) Exam 2021 Statistics Paper-I Answer Key
  • CS (Main) Exam Statistics Syllabus
  • UPSC Civil Services Exam Syllabus
  • CS (Main) Exam Pattern
  • UPSC Civil Services Exam Pattern

Instructions

  • पुस्तिका के मुख-पृष्ठ पर निर्दिष्ट स्थान पर किया जाना चाहिए ।
  • प्राधिकृत माध्यम के अतिरिक्त अन्य किसी माध्यम में लिखे गए उत्तर पर कोई अंक नहीं मिलेंगे ।
  • यदि आवश्यक हो, तो उपयुक्त आँकड़ों का चयन कीजिए तथा उनको निर्दिष्ट कीजिए ।
  • जब तक उल्लिखित न हो, संकेत तथा शब्दावली प्रचलित मानक अर्थों में प्रयुक्त हैं ।
  • प्रश्नों के उत्तरों की गणना क्रमानुसार की जाएगी ।
  • यदि काटा नहीं हो, तो प्रश्न के उत्तर की गणना की जाएगी चाहे वह उत्तर अंशतः दिया गया हो ।
  • प्रश्न-सह-उत्तर (क्यू.सी.ए.) पुस्तिका में खाली छोड़ा हुआ पृष्ठ या उसके अंश को स्पष्ट रूप से काटा जाना चाहिए ।

  • There are EIGHT questions divided in TWO SECTIONS and printed both in HINDI and in ENGLISH.
  • Candidate has to attempt FIVE questions in all.
  • Questions no. 1 and 5 are compulsory and out of the remaining, any THREE are to be attempted choosing at least ONE question from each section.
  • The number of marks carried by a question / part is indicated against it.
  • Answers must be written in the medium authorized in the Admission Certificate which must be stated clearly on the cover of this Question-cum-Answer (QCA) Booklet in the space provided.
  • No marks will be given for answers written in a medium other than the authorized one.
  • Assume suitable data, if considered necessary, and indicate the same clearly.
  • Unless and otherwise indicated, symbols and notations carry their usual standard meanings.
  • Attempts of questions shall be counted in sequential order.
  • Unless struck off, attempt of a question shall be counted even if attempted partly.
  • Any page or portion of the page left blank in the Question-cum-Answer (QCA) Booklet must be clearly struck off.

Questions (page 2)

Section A

Q1.

(a) सर्जिकल मास्क बनाने वाली एक उत्पादन इकाई की मास्क की गुणवत्ता जाँचने में रुचि है। दोषपूर्ण मास्क बनाने की प्रायिकता, 'p', के आकलन के लिए n मास्क के एक यादृच्छिक प्रतिदर्श का निरीक्षण किया गया । प्रतिदर्श कितना बड़ा होना चाहिए ताकि 0.95 प्रायिकता के साथ p के आकलक का परिसर p pm 0.1 हो ?
A production unit manufacturing surgical masks is concerned about the quality of their masks. A random sample of n masks are inspected to estimate 'p', the probability of manufacturing a defective mask. How large a sample is required so that the estimate of p lies in the range p pm 0.1 with probability 0.95?

(b) एक बीमा कम्पनी ने 150 पॉलिसी-धारकों के प्रतिदर्श का अध्ययन किया । पॉलिसी के तीन वर्ग हैं : वाहन, गृह और चिकित्सा । पॉलिसी-धारकों द्वारा गृहित पॉलिसियों के संबंध में निम्न परिणाम प्राप्त हुए :
(i) 30 के पास केवल गृह बीमा है
(ii) 10 के पास केवल चिकित्सा बीमा है
(iii) 98 के पास वाहन बीमा है, लेकिन सभी तीन प्रकार के बीमा नहीं हैं
(iv) 27 के पास चिकित्सा बीमा है, लेकिन सभी तीन प्रकार के बीमा नहीं हैं
(v) 13 के पास वाहन और चिकित्सा बीमा है
यदि यह दिया हुआ है कि पॉलिसी-धारक के पास चिकित्सा बीमा है, तो उसके पास गृह बीमा होने की प्रायिकता परिकलित कीजिए ।
An insurance company studies a sample of 150 policy-holders. There are three categories of policies : auto, home and medical. The following results are obtained about the policies held by the policy-holders :
(i) 30 have only home insurance
(ii) 10 have only medical insurance
(iii) 98 have auto insurance, but not all three types of insurance
(iv) 27 have medical insurance, but not all three types of insurance
(v) 13 have auto and medical insurance
Given that a policy-holder has medical insurance, calculate the probability that he has home insurance.

Question paper preview

Scanned pages 1–2 for reference. Download the official PDF for the full paper.

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UPSC CS Main 2021 Statistics Paper I question paper page 1 instructions scan PDF download
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UPSC CS Main 2021 Statistics Paper I question paper page 1 instructions scan PDF download

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Frequently asked questions

What is the name of the exam?

The exam is the CS (Main) Exam.

Which paper is this question paper for?

This is for Statistics Paper-I.

What is the conducting body?

The conducting body is UPSC.

In which year was this exam conducted?

The exam was conducted in 2021.

What is the maximum marks for this paper?

The maximum marks for Statistics Paper-I is 250.

What is the time allowed to complete the paper?

The time allowed is three hours.

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