若总体的标准差为[tex=0.571x0.786]KMF8QHqVjNLkn7nK5uaSag==[/tex]，按重复抽样的方法从总体中抽出容量为n的样本，则样本均值的标准差是
未知类型：{'options': ['[tex=1.786x2.429]R5cCMPD2ylEn3TDorndB9pCTwalQu10NmVWiz8W0t40=[/tex]', '[tex=0.857x2.143]QyWat/54KOGEeBqeUafaK7OtHo6PNgPBvksKMQvovh0=[/tex]', '[tex=1.286x2.5]4INVXVTVfBsrWE9JMX1+xLje0Npw75aMe9smcelkkhM=[/tex]', '[tex=6.357x3.429]428lOQzTErmCWI8d/2q3PvLZzvYkOcylyUCIjj9Me5zjz7nnWnQXJLbWYsGPSL8WfjpAwPyXGHBE+BCtUAxA2w==[/tex]'], 'type': 102}
未知类型：{'options': ['[tex=1.786x2.429]R5cCMPD2ylEn3TDorndB9pCTwalQu10NmVWiz8W0t40=[/tex]', '[tex=0.857x2.143]QyWat/54KOGEeBqeUafaK7OtHo6PNgPBvksKMQvovh0=[/tex]', '[tex=1.286x2.5]4INVXVTVfBsrWE9JMX1+xLje0Npw75aMe9smcelkkhM=[/tex]', '[tex=6.357x3.429]428lOQzTErmCWI8d/2q3PvLZzvYkOcylyUCIjj9Me5zjz7nnWnQXJLbWYsGPSL8WfjpAwPyXGHBE+BCtUAxA2w==[/tex]'], 'type': 102}
举一反三
- set1 = {x for x in range(10)} print(set1) 以上代码的运行结果为？ A: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9} B: {0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10} C: {1, 2, 3, 4, 5, 6, 7, 8, 9} D: {1, 2, 3, 4, 5, 6, 7, 8, 9,10}
- >>>x= [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9]>>>print(x.sort()) 语句运行结果正确的是( )。 A: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] B: [10, 6, 0, 1, 7, 4, 3, 2, 8, 5, 9] C: [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0] D: ['2', '4', '0', '6', '10', '7', '8', '3', '9', '1', '5']
- 假设所有变量均为整型, 则表达式[tex=10.571x1.357]LwbIklUNi3bG92VfuhR/2s2h8bPim4KlwMHG5pBJ+3PKMuWS/4OGtcmSMjC2vxzVyrIKC8OVgBRFsqcS0s1A1u2X9g+VlWD58VLIpTfy7/0=[/tex]后[tex=0.571x0.786]FLCxr+5eRIYnIT0kyTRrXg==[/tex]的值为 未知类型：{'options': ['7', '8', '6', '2'], 'type': 102}
- 【计算题】5 ×8= 6×4= 7×7= 9×5= 2×3= 9 ×2= 8×9= 7×8= 5×5= 4×3= 5+8= 6 ×6= 3×7= 4×8= 9×3= 1 ×2= 9×9= 6×8= 8×0= 4×7=
- 若要将一个长度为N=16的序列x(n)重新位倒序,作为某一FFT算法的输入,则位倒序后序列的样本序号为( )。 A: x(15), x(14), x(13), x(12), x(11), x(10), x(9), x(8), x(7), x(6),<br/>x(5), x(4), x(3), x(2), x(1), x(0) B: x(0), x(4), x(2), x(6), x(1), x(5), x(3), x(7), x(8), x(12), x(10),<br/>x(14), x(9), x(13), x(11), x(15) C: x(0), x(2), x(4), x(6), x(8), x(10), x(12), x(14), x(1), x(3), x(5),<br/>x(7), x(9), x(11), x(13), x(15) D: x(0), x(8), x(4), x(12), x(2), x(10), x(6), x(14), x(1), x(9), x(5),<br/>x(13), x(3), x(11), x(7), x(15)