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in normal distribution with mean of 15 and standard deviation of 3 ,what does a z score of -2 Indicate?


Sagot :

Answer:

The z score is a standardized statistics meaning that the percentage of observation that fall between any two points is known. For example, all values below a z score of 1.96 represent 97.5% of the cumulative probability and all values below 1.28 represent 90% of the cumulative probability.