The average (arithmetic mean) of the integers from 25 to 225, inclusive, is how much lower than the average of the integers from 50 to 1050 inclusive? Choose the most appropriate option.
A) 450 B) 375 C) 500 D) 425 E) 400
For an AP the mean or average of series is average of first and last term.   So, average of numbers between 50 to 1050, inclusive = (50+1050)/2= 
<gadget id="calculator">(50+1050)/2</gadget>
<output>550</output>
550   average of numbers between 25 to 225, inclusive= (25+225)/2= 
<gadget id="calculator">(25+225)/2</gadget>
<output>125</output>
125   difference= 550 - 125= 
<gadget id="calculator">550 - 125</gadget>
<output>425</output>
425   Answer is 425
<result>D</result>
The average (arithmetic mean) of the integers from 25 to 225, inclusive, is how much lower than the average of the integers from 50 to 1050 inclusive?