SSC CGL Quant – Statistics & Probability – Level 2 · Exam Level · Revision Round
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N = 30; cumulative frequencies 4, 10, 19 → the 15th and 16th values are both 3.
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SSC CGL Quant – Statistics & Probability – Level 2 · Exam Level · Revision Round – 12 questions, subject: Quantitative Aptitude. Every question has the correct answer with a one-line explanation; tap "Show Answer". Free practice for TNPSC, UPSC, SSC, Bank and RRB exams – Shanmugam IAS Academy, Coimbatore.
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1.
What is the mean of 7, 11, 13, 17 and 22?
Correct Answer: D [14]
Explanation:
Sum 70 ÷ 5 = 14.
2.
What is the median of 15, 8, 22, 11, 19, 30, 6 and 25?
Correct Answer: B [17]
Explanation:
Sorted: 6, 8, 11, 15, 19, 22, 25, 30 → (15 + 19)/2 = 17.
3.
What is the mode of 3, 5, 5, 8, 3, 5, 9, 8, 5?
Correct Answer: A [5]
Explanation:
5 occurs four times – more than any other value.
4.
The average of five consecutive even numbers is 36. What is the largest of them?
Correct Answer: B [40]
Explanation:
They are 32, 34, 36, 38, 40 (the average is the middle one).
5.
The variance of a data set is 36. If every observation is halved, what is the new variance?
Correct Answer: D [9]
Explanation:
Dividing by 2 divides the SD by 2 (6 → 3) and the variance by 4 (36 → 9).
6.
What is the range of the first ten prime numbers?
Correct Answer: C [27]
Explanation:
The first ten primes run from 2 to 29 → range 29 − 2 = 27.
7.
A fair die is thrown once. What is the probability of getting a number greater than 4?
Correct Answer: C [1/3]
Explanation:
Favourable 5, 6 → 2/6 = 1/3.
8.
Two fair dice are thrown together. What is the probability that the sum is 7?
Correct Answer: D [1/6]
Explanation:
(1,6), (2,5), (3,4), (4,3), (5,2), (6,1) → 6/36 = 1/6.
9.
One card is drawn from a well-shuffled pack of 52 cards. What is the probability that it is a black ace?
Correct Answer: B [1/26]
Explanation:
Black aces: spade and club → 2/52 = 1/26.
10.
A bag has 6 white and 4 black balls. Two balls are drawn together at random. What is the probability that both are white?
Correct Answer: A [1/3]
Explanation:
⁶C₂/¹⁰C₂ = 15/45 = 1/3 (9/25 would be with replacement).
11.
40 boys have a mean score of 52 and 60 girls have a mean score of 47. What is the mean score of all 100 students?
Correct Answer: C [49]
Explanation:
(40 × 52 + 60 × 47)/100 = (2080 + 2820)/100 = 49.
12.
Values 1, 2, 3, 4, 5 occur with frequencies 4, 6, 9, 5, 6. What is the median?
Correct Answer: A [3]
Explanation:
N = 30; cumulative frequencies 4, 10, 19 → the 15th and 16th values are both 3.
➤ Full notes, shortcuts and every answer explained – SSC CGL 2026 Quantitative Aptitude book (₹149): www.shanmugamiasacademy.in/study-materials/ssc-cgl-quantitative-aptitude
📘 TNPSC திறனறிவும் மனக்கணக்கு நுண்ணறிவும் (Aptitude & Mental Ability) – முழுமையான பாடநூல்
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