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  1. Prepare
  2. Artificial Intelligence
  3. Probability & Statistics - Foundations
  4. Standard Deviation Puzzles - 5
  5. Discussions

Standard Deviation Puzzles - 5

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8 Discussions

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  • musselsjab
     + 0 comments

    It’s interesting to see how adding a constant to every value doesn’t change the standard deviation, just the mean. Great reminder for anyone working with distributions and transformations. Unblocked Games

  • nadh_if_taher_a1
     + 0 comments

    SD[X] = sqrt(expectation[(X-mean)**2]) if every X is added 10 units, the mean will be 45 (prev mean) + 10. So the new SD[X]: SD[X+10] = sqrt(expectation[(X+10-(mean+10))**2]) = sqrt(expectation[(X-mean))**2]) = SD[X] (old std.dev)

  • mokshithakakarl1
     + 0 comments

    original_sd = 10 new_sd = original_sd print(f"{new_sd:1f}")

  • petitmath
     + 0 comments

    The checker is broken. It accepts 9.9 and 10.1 values, while none of them are actually correct.

  • amr_askar
     + 0 comments
    import numpy as np
np.random.seed(0)
scores = np.random.normal(loc=45, scale=10, size=500) + 10
s = np.std(scores)
print(f'{s:0.1f}')