Answer:
oF is the cutoff for the highest 10% of human body temperatures
Step-by-step explanation:
The confidence interval for this problem is
%
We will first evaluate the z-value for 90% confidence interval considering it one tailed.
Z from the statics table is equal to

Formula for z - value

where
x represents the required cut off value
u represents the mean value
and α represents the standard deviation
Substituting the values in above equation, we get -

Hence,
oF is the cutoff for the highest 10% of human body temperatures