Sawaal
35
Q:

I forgot the last digit of a 7-digit telephone number. If 1 randomly dial the final 3 digits after correctly dialing the first four, then what is the chance of dialing the correct number?

A) 1/999 B) 1/1001
C) 1/1000 D) 4/1000

Answer:   C) 1/1000



Explanation:

It is given that last three digits are randomly dialled. then each of the digit can be selected out of 10 digits in 10 ways.
Hence required probability =1103 = 1/1000

Subject: Probability - Quantitative Aptitude - Arithmetic Ability
Related Questions
Q:

If the standard deviation of 0, 1, 2, 3 ......... 9 is K, then the standard deviation of 10, 11, 12, 13 ........... 19 will be:

 

A) K+1 B) K
C) K+4 D) K+8
 
Answer & Explanation Answer: B) K

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

5 1228
Q:

The standard deviation of the set {10, 11, 12, 9, 8} is

A) 1 B) √2
C) 2 D) 2√2
 
Answer & Explanation Answer: B) √2

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

7 1225
Q:

Find the range of the data 2, 1, 2, 3, 5, 4, 7, 3, 5, 2, 4.

A) 5 B) 4
C) 3 D) 6
 
Answer & Explanation Answer: D) 6

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

2 1071
Q:

Find the median, mode and mean of 9, 5, 8, 9, 9, 7, 8, 9, 8.

A) 9, 9, 9 B) 9, 8, 9
C) 8, 9, 8 D) 8, 9, 9
 
Answer & Explanation Answer: C) 8, 9, 8

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

4 1093
Q:

In the usual set notation, A ∪ (B ∩ C) =

 

 

A) A∪B∪A∪C B) A∩B∪A∩C
C) A∪B∩A∪C D) A∪B∩A∩C
 
Answer & Explanation Answer: C) A∪B∩A∪C

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

2 4250
Q:

Find the range and mode of the data 17, 18, 28, 19, 16, 18, 17, 29, 18

A) 12 and 18 B) 13 and 18
C) 12 and 17 D) 11 and 17
 
Answer & Explanation Answer: B) 13 and 18

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

3 1272
Q:

Find the standard deviation of {11, 7, 10,13, 9}

A) 1 B) 2
C) 4 D) 5
 
Answer & Explanation Answer: B) 2

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

3 1383
Q:

A table tennis player, lost 12 games out of 18 games played. Calculate the games won in terms of decimal.

A) 0.667 B) 0.067
C) 0.50 D) 0.333
 
Answer & Explanation Answer: D) 0.333

Explanation:
Report Error

View Answer Report Error Discuss

Filed Under: Probability - Quantitative Aptitude - Arithmetic Ability
Exam Prep: Bank Exams

3 1375