Suppose that the hemoglobin levels among healthy females arenormally distributedwith ameanof13.9

gm

dL

. Research shows that exactly95

%

of healthy females have a hemoglobin level below15.9

gm

dL

. What is thestandard deviationof the distribution of hemoglobin levels in healthy females? Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places.