Probability & Statistics

33 questions available

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Showing 1–20 of 33

Q1.Let X1=10, X2=13, X4=15, compute Summation XI=?

Hard
A 30
B 40
C 50
D 60
Mean PPSC 2026

Correct Answer: C

Q2.If A and B are mutually exclusive events then?

Hard
A A U B =0
B A U C =1
C A U B =2
D None of these
Basic Probability PPSC 2026

Correct Answer: A

Q3.A box contains 8 red, 6 green and 7 blue toys. One of the toys is randomly picked; what is the probability that the toy picked is neither red nor green?

Medium
A 7/21
B 14/21
C 7/14
D None of these
Basic Probability CSS 2026

Correct Answer: A

P(neither red nor green) = P(blue) = 7/21.

Q4.What is the mean of 11, 21 and 31?

Easy
A 21
B 22
C 20
D 23
Mean PPSC 2024

Correct Answer: A

Mean = (11 + 21 + 31) ÷ 3 = 21.

Q5.What is the mean of 12, 22 and 32?

Easy
A 22
B 23
C 21
D 24
Mean PPSC 2024

Correct Answer: A

Mean = (12 + 22 + 32) ÷ 3 = 22.

Q6.What is the mean of 13, 23 and 33?

Easy
A 23
B 24
C 22
D 25
Mean PPSC 2024

Correct Answer: A

Mean = (13 + 23 + 33) ÷ 3 = 23.

Q7.What is the mean of 14, 24 and 34?

Easy
A 24
B 25
C 23
D 26
Mean PPSC 2024

Correct Answer: A

Mean = (14 + 24 + 34) ÷ 3 = 24.

Q8.What is the mean of 15, 25 and 35?

Easy
A 25
B 26
C 24
D 27
Mean PPSC 2024

Correct Answer: A

Mean = (15 + 25 + 35) ÷ 3 = 25.

Q9.What is the mean of 16, 26 and 36?

Easy
A 26
B 27
C 25
D 28
Mean PPSC 2024

Correct Answer: A

Mean = (16 + 26 + 36) ÷ 3 = 26.

Q10.What is the mean of 17, 27 and 37?

Easy
A 27
B 28
C 26
D 29
Mean PPSC 2024

Correct Answer: A

Mean = (17 + 27 + 37) ÷ 3 = 27.

Q11.What is the mean of 18, 28 and 38?

Easy
A 28
B 29
C 27
D 30
Mean PPSC 2024

Correct Answer: A

Mean = (18 + 28 + 38) ÷ 3 = 28.

Q12.What is the mean of 19, 29 and 39?

Easy
A 29
B 30
C 28
D 31
Mean PPSC 2024

Correct Answer: A

Mean = (19 + 29 + 39) ÷ 3 = 29.

Q13.What is the mean of 20, 30 and 40?

Easy
A 30
B 31
C 29
D 32
Mean PPSC 2024

Correct Answer: A

Mean = (20 + 30 + 40) ÷ 3 = 30.

Q14.A bag contains 11 balls, of which 5 are red. What is the probability of drawing a red ball?

Easy
A 5/11
B 6/11
C 4/11
D 5/12
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 5/11.

Q15.A bag contains 12 balls, of which 6 are red. What is the probability of drawing a red ball?

Easy
A 6/12
B 7/12
C 5/12
D 6/13
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 6/12.

Q16.A bag contains 13 balls, of which 7 are red. What is the probability of drawing a red ball?

Easy
A 7/13
B 8/13
C 6/13
D 7/14
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 7/13.

Q17.A bag contains 14 balls, of which 8 are red. What is the probability of drawing a red ball?

Easy
A 8/14
B 9/14
C 7/14
D 8/15
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 8/14.

Q18.A bag contains 15 balls, of which 9 are red. What is the probability of drawing a red ball?

Easy
A 9/15
B 10/15
C 8/15
D 9/16
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 9/15.

Q19.A bag contains 16 balls, of which 10 are red. What is the probability of drawing a red ball?

Easy
A 10/16
B 11/16
C 9/16
D 10/17
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 10/16.

Q20.A bag contains 17 balls, of which 11 are red. What is the probability of drawing a red ball?

Easy
A 11/17
B 12/17
C 10/17
D 11/18
Basic Probability PPSC 2024

Correct Answer: A

Probability = favourable outcomes ÷ total outcomes = 11/17.