assume that the duration od human pregnancies can be described by a normal model with a mean 266 days and standard deviation 16 days.
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First transform x=260 to z-score: z=(260-266)/16=- 6/16= -.375
This is still a little confusing the final answer that im trying to get is 0.002 but im unsure how to get there
sorry,I missed the negative sign of z but the final answer is the same.
In order to get a prob. of .002, z must be equal to -2.87. I have no idea why it should be .002
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