中等MATH-STAT-008
A set has mean 50 and standard deviation 4. After the coding y = (x − 50)/2, what is the standard deviation of y?
A. 4
B. 2✓ 答案
C. 1
D. 0
解說
Subtracting 50 does not change the standard deviation. Dividing by 2 multiplies it by 1/2, so it becomes 2. The new mean is 0, but the spread is not 0.