The mean, the median, and the mode of the five numbers below are all equal. What number does A represent? 1.8 1.6 2.1 1.7 A

sorted: 1.6, 1.7, 1.8, 2.1 


Mean = (A+7.2)/5 


the middle choices are 1.7 and 1.8. Test 1.7: 

A=5*1.7-7.2= 1.3 (no because this value leaves us without a mode) 

Testing 1.8: 

A=5*1.8-7.2= 1.8 


A=1.8 

:)