The temperature for a random day in April in Long Beach is normally distributed with an average of 77 degrees Fahrenheit and a standard deviation 9 degrees Fahrenheit.  Let the sample mean, t, be the average temperature for a week.  What is the probability this average temperature is between 72 and 80 degrees Fahrenheit, P({72

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Chapter1: Combinatorial Analysis
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The temperature for a random day in April in Long Beach is normally distributed with an average of 77 degrees Fahrenheit and a standard deviation 9 degrees Fahrenheit.  Let the sample mean, t, be the average temperature for a week.  What is the probability this average temperature is between 72 and 80 degrees Fahrenheit, P({72<t<80})?  Hint{what is the size of the sample?}

a)0.3416

b)0.7398

c).3381

d).7388

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