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This problem is a simple version of control charts in statistics. Intput consists from 30 or more observations.

- Upper limit = mean(input) + 3 * std(input)
- Lower limit = mean(input) - 3 * std(input)

If all of the observations are between upper limit and lower limit then return true.

20 correct solutions
30 incorrect solutions

Last solution submitted on Aug 23, 2015

1 Comment

Ryan Vande Water
on 9 Dec 2013

test suite is correct, but the problem statement is incorrect. Upper limit should be mean PLUS 3 stdev, and lower limit should be minus 3 stdev.

1 player likes this solution

1 Comment

Ryan Vande Water
on 9 Dec 2013

well-played sir!

2 Comments