# Modern/Abstract Algebra Problem (Group Theory)

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What are the normal subgroups in S_4?

I would appreciate it if someone could also give a thourough explanation of how they came up with the answer.

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##### Solution Summary

Normal subgroups are determined for modern/abstract ground theory. .

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Solution. Set of permutations {1,2,3,4} with product operation of composition forms a group. Order of S4 is n*(n-1)*...*2.1=24 elements.

Permutation types of {1,2,3,4} are

Four 1 cycles (1)(2)(3)(4) identity 12341234 4!/(1^4*4!)=1 g1

One 2 cycle (12)(3)(4) transposition ...

###### Education

- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
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- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
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