Ethan Yeo's answer to Annela's Junior College 1 H2 Maths Singapore question.
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Hope this helps :))
Yeah as mentioned in the comments, generally z is only used when either the mean and/or the standard deviation is unknown. Otherwise, it's ok to use the normal method of solving normal distribution :D
Yeah as mentioned in the comments, generally z is only used when either the mean and/or the standard deviation is unknown. Otherwise, it's ok to use the normal method of solving normal distribution :D
Date Posted:
3 years ago
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