top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Age of 4 members in a family are: 2 years, 6 years, 8 years and 16 years. Fine standard deviation of their ages?

0 votes
203 views
Age of 4 members in a family are: 2 years, 6 years, 8 years and 16 years. Fine standard deviation of their ages?
posted Aug 17, 2017 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

Average = (2+6+8+16)/4 = 32/4 = 8.
Variance = ((8-2)^2 + (8-6)^2 + (8-8)^2 + (8-16)^2)/4 = (36+4+0+64)/4 = 26.
Standard Deviation = 26^0.5 = 5.099
Sample Standard Deviation = 5.8878

answer Aug 19, 2017 by Tejas Naik



Similar Puzzles
0 votes
Raghav scored below runs in his last 7 innings 13, 38, 3, 29, 14, 68, 17. Find population standard deviation?

Raghav scored below runs in his last 7 innings
13, 38, 3, 29, 14, 68, 17.

Find population standard deviation for his score in last 7 innings?

0 votes
What is the difference between population standard deviation between second match and first match?

Run scored by Murali, Shikhar, Rahul, Virat, Ajinkya, Hardik, Dinesh, Ashwin, Shami, Ishant and Umesh in 1st match are :
33, 24, 19, 21, 41, 39, 37, 47, 38, 29 and 26 respectively.
Run scored by Murali, Shikhar, Rahul, Virat, Ajinkya, Hardik, Dinesh, Ashwin, Shami, Ishant and Umesh in 2nd match are :
13, 44, 19, 93, 41, 76, 33, 44, 29, 11 and 7 respectively.
What is the difference between population standard deviation between second match and first match?

0 votes
Present ages of A,B and C are in ratio 4:5:6. Eight years ago sum of their ages was 66. Sum of present age of A and C?

The present ages of A,B and C are in proportions 4:5:6. Eight years ago, the sum of their ages was 66. What is the sum of present age of A and C?

Solve this without paper and pen?

0 votes
Average age of 6 children's of a family is 8 years. The average of....................then find the age of their mother.

Average age of 6 children's of a family is 8 years.
The average of children's and their parent's age is 22 years.
If father is 8 years older than the mother then find the age of their mother.

...