Question 1051620
z=(x-mean)/sd
=(98.1-98.6)/0.6
=-0.83333
z < -0.8333 is probability of 0.2023 or 20.23%
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The upper 90% percentile is the complement of the lowest 10 th percentile, which is z=-1.282
-1.282=(x-98.6)/0.6
x-98.6=-0.7692=-0.77
x=97.83 or 97.8 degrees