单选题
Find the mean and the mean absolute deviation (MAD) of a series of stock market returns.
A、
Yr.1
B、
14 percent
C、
Yr.2
D、
20 percent
E、
Yr.3
F、
24 percent
G、
Yr.4
H、
22 percent
【正确答案】
B
【答案解析】
(14 +20 +24 +22)/4 =20 (mean) Take the absolute value of the differences and divide by n. MAD = [(14-20)+ 20-20)+(24-20)+(22-20)]/4=3%.
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