Calculate the mean absolute deviation from the given data set.
4, 8, 13, 15, 24, 25, 28 ( can someone tell me why i got this question wrong? i picked b)

a. 7.67
b. 16.7
c. 6.5
d. 15

First we find the mean of the data set: M=(4+8+13+15+24+25+28)/7=16.7. Now we find the distance of each value from the mean value:
16.7-4=12.7, 16.7-8=8.7, 16.7-13=3.7, 16.7-15=1.7, 24-16.7=7.3, 25-16.7=8.3 and 28-16.7=11.3. Now we find the mean absolute deviation by finding the mean value of the distances: (12.7+8.7+3.7+1.7+7.3+8.3+11.3)/7=53.7/7=7.67. So the mean absolute value is A) 7.67.
The mistake was that in calculating only the mean value, not the mean absolute deviation. 

It is true that organism need food. but cells do not need food. the energy required by the cell for various chemical activities is released by mitochondria in the form of atp (adenosine triphosphate). atp is know as energy currency of the cell.hope it

The answer is -pie over 2