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Where did the data on the table came from? What is z1 Score or area between Zscores?

26318862-398194.jpeg

What percent of pregnancies last less than 240 days?
5.2%
Area Between Zscores
21 Score
16.625
Rand Var XI
Z2 Score
-1.625
Rand Var X2
240
Mean
266
Std Dev
16
Area
0.052081279

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