chocolate bars produced certain machine are labeled 80 oz distribution actual weights these

Chocolate bars produced by a certain machine are labeled with 8.0 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 oz. A chocolate bar is considered underweight if it weighs less than 8.0 oz. 

 

 

 

What proportion of chocolate bars weights less than 8.0 oz? 

 

 
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