A list of 4 numbers a, b, c, d has standard deviation equal to that of which of the following list?
1) |a|,|b|,|c|,|d|
2) a+1, b+1, c+1, d+1
3) 5a, 5b, 5c, 5d
4) a^4,b^4,c^4,d^4
5) 2a+1, 2b+1, 2c+1, 2d+1
1) |a|,|b|,|c|,|d|
2) a+1, b+1, c+1, d+1
3) 5a, 5b, 5c, 5d
4) a^4,b^4,c^4,d^4
5) 2a+1, 2b+1, 2c+1, 2d+1
