Question: Is normal distribution always symmetrical? Why or why not? can't it still be a bell shaped curve of the Mean is Zero and the SD

Is normal distribution always symmetrical? Why or why not?

can't it still be a bell shaped curve of the Mean is Zero and the SD be -1, + 1; -2 +2 and -3, +3?

Explain your answer, and cite specific sources to support it.

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