can someone help me figure out this statistic question?

Ari O

New member
Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of 13.9 gm/dL. Research shows that exactly 95% of healthy females have a hemoglobin level below 16 gm/dL. What is the standard deviation of the distribution of hemoglobin levels in healthy females?
 
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