JEE Main Probability & Statistics: Statistics – Chapter Test
JEE Main Probability & Statistics: Statistics – Chapter Test is an online chapter test in the JEE Main pattern, covering Probability & Statistics. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.
Topics in this test
| Topic | Questions |
|---|---|
| Probability & Statistics | 20 |
Difficulty: 7 medium · 13 hard
Statistics MCQ questions with answers
The first 3 of 20 questions. Unlock the series for the rest, each with a solution.
Q1. The coefficient of variation of a data set is defined as:
एक आँकड़ा समुच्चय का विचरण गुणांक निम्नलिखित रूप में परिभाषित किया जाता है:
- A. (Mean / Standard deviation) × 100 / (माध्य / मानक विचलन) × 100
- B. (Variance / Mean) × 100 / (प्रसरण / माध्य) × 100
- C. (Standard deviation × Mean) × 100 / (मानक विचलन × माध्य) × 100
- D. (Standard deviation / Mean) × 100 / (मानक विचलन / माध्य) × 100
Solution
The coefficient of variation is the ratio of the standard deviation to the mean, expressed as a percentage: CV = (SD/Mean) × 100. It is a unit-free relative measure of dispersion.
विचरण गुणांक, मानक विचलन और माध्य का अनुपात होता है, जिसे प्रतिशत में व्यक्त किया जाता है: CV = (मानक विचलन/माध्य) × 100। यह अपकिरण का इकाई-रहित सापेक्ष माप है।
Q2. If the mean of observations x1, x2, ..., xn is x̄, and new observations are defined as y_i = 2x_i − 10 for each i, then the mean of y1, y2, ..., yn is:
यदि प्रेक्षणों x1, x2, ..., xn का माध्य x̄ है, और नए प्रेक्षण y_i = 2x_i − 10 के रूप में प्रत्येक i के लिए परिभाषित किए जाते हैं, तो y1, y2, ..., yn का माध्य है:
- A. 2x̄ − 10
- B. 2x̄ + 10
- C. 2(x̄ − 10)
- D. x̄ − 10
Solution
The mean follows the same linear transformation as the data itself: mean(y) = 2·mean(x) − 10 = 2x̄ − 10. The other options incorrectly add the constant instead of subtracting it, or subtract it before scaling.
माध्य, आँकड़ों के समान ही रैखिक रूपांतरण का अनुसरण करता है: माध्य(y) = 2·माध्य(x) − 10 = 2x̄ − 10। अन्य विकल्प गलती से अचर को घटाने के बजाय जोड़ देते हैं, या गुणा करने से पहले उसे घटा देते हैं।
Q3. Which one of the following is NOT a measure of dispersion?
निम्नलिखित में से कौन-सा एक अपकिरण का माप नहीं है?
- A. Mean deviation / माध्य विचलन
- B. Range / परिसर
- C. Quartile deviation / चतुर्थक विचलन
- D. Mode / बहुलक
Solution
Range, quartile deviation and mean deviation all measure the spread of data. The mode is a measure of central tendency, not dispersion.
परिसर, चतुर्थक विचलन और माध्य विचलन सभी आँकड़ों के फैलाव को मापते हैं। बहुलक केंद्रीय प्रवृत्ति का माप है, अपकिरण का नहीं।
Frequently asked questions
How many questions are in the JEE Main Probability & Statistics: Statistics – Chapter Test?
20 questions for 20 marks, to be answered in 20 minutes.
Is there negative marking in the JEE Main Probability & Statistics: Statistics – Chapter Test?
Yes — 0.25 marks are deducted for each wrong answer, as in the real exam pattern.
Which topics does the JEE Main Probability & Statistics: Statistics – Chapter Test cover?
Probability & Statistics (20 questions).
Is the JEE Main Probability & Statistics: Statistics – Chapter Test free?
It is part of the JEE Main 2027 Mock Test Series (104 tests, ₹299). You can first try Basic Concepts & Atomic Structure – Topic Test for free.
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