2. The mean birth weight of a full term boy born in the US is 7.7 lbs, with standard deviation of 1.1 lbs. A. Find the probability that a boy born full term in the US weighs less than 7 lbs. B. Find the probability that the average weight of 25 baby boys born in a particular hospital have an average weight less than 7 lbs.

A

The value is

B

The value is

Step-by-step explanation:

From the question we are told that

  The population mean is  

   The standard deviation is

  The sample size is  n =  25

Generally the probability that a boy born full term in the US weighs less than 7 lbs is mathematically represented as

=>  

From the z table  the area under the normal curve to the left corresponding to    -0.6364  is

=>  

Generally the standard error of mean is mathematically represented as  

=>    

=>    

Generally the probability that the average weight of 25 baby boys born in a particular hospital have an average weight less than 7 lbs is mathematically represented as

=>      

From the z table  the area under the normal curve to the left corresponding to    -3.1818  is

=>      

=>      

step-by-step explanation:

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