Data x1, X2 The mean of XN is x, the variance is S & # 178, then 2x1 + 3,2x2 + 3 2xn + 3 mean and variance the 2x + 3,4s & # 178 I chose; Did I choose the right question for the final exam today? Don't beat me up

Data x1, X2 The mean of XN is x, the variance is S & # 178, then 2x1 + 3,2x2 + 3 2xn + 3 mean and variance the 2x + 3,4s & # 178 I chose; Did I choose the right question for the final exam today? Don't beat me up

Zheng positive solution