If the average (arithmetic mean) of 5 positive temperatures is z degrees Fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be:  Choose the correct choice from the following options
A) 6z	B) 4z	C) 5z/3	D) 3z/2	E) 3z/5
The sum of three greatest should be more than sum of two lowest.   The total sum is; 5z   A. 6z; 6z is more than 5z. Not possible.   B. 4z; 5z-4z=z(Possible)   C. 5z/3; 10z/3; 10z/3 &gt; 5z/3. Not possible   D. 3z/2; 7z/2; 7z/2 &gt; 3z/2. Not possible   E. 3z/5; 22z/5; 22z/5 &gt; 3z/5. Not possible.   Ans:4z
<result>B</result>
If the average (arithmetic mean) of 5 positive temperatures is z degrees Fahrenheit, then the sum of the 3 greatest of these temperatures, in degrees Fahrenheit, could be: