The mean of 20 observations was 36. It was found later that an observation 25 was wrongly taken as 40. The corrected new mean is Options:	A) 30	B) 25.4	C) 40	D) 35.25	E) 26.55
Explanation:   Correct Sum = (36 * 20 + 25 - 40)= 
<gadget id="calculator">(36 * 20 + 25 - 40)</gadget>
<output>705</output>
705   Correct mean= = 705/20= 
<gadget id="calculator">705/20</gadget>
<output>141/4 = around 35.25</output>
35.25   Answer: 35.25
<result>D</result>
The mean of 20 observations was 36. It was found later that an observation 25 was wrongly taken as 40. The corrected new mean is