(1)设随机变量X满足 ^3sim N((1,7)^2), 记标准正态分布函数为ϕ(x),则-|||- 1lt Xlt 2 的值为 ()-|||-A. (2)-(1) B. Phi (sqrt [3](2))-(1) C. (1)-0.5 D. Phi (sqrt [3](3))-(1-sqrt [3](2))