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Aarti · Accepted Answer

56)
Solution (a):
Given,
The population standard deviation is given, therefore, we use the standard normal distribution 
The required confidence interval lies between (96.828, 99.572). With 95% confidence, we can conclude that the population mean lies between the above mentioned lower and upper bound.
Solution (b):
Using the conversion of normal distribution to standard normal distribution,  
The required probability is calculated as:
 
Therefore, 50% of the individuals would be expected to have body temperature more than 98.6F.
Solution (c):
The coolest 20% of all the individuals are located till:
 

Below 98.012F,

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