Sorry for my mistake. I saw your topic at three o\’clock in the morning last night, so I didn\’t read it carefully, now I will explain it again

1.c

Option (c) \”plot(X, Y, \’bx\’)\” . This will create a plot with blue crosses as markers, where \’b\’ specifies the blue color and \’x\’ specifies the marker style as a cross. By default, the plot function will connect the data points with a line, but since no line style is specified, it will use the default line style of \’-\’ which will be invisible due to the markers being crosses.

Option (e) \”plot(X, Y, \’b*\’)\” . This will creates a 2D plot with blue asterisks as markers for the data points defined by the X and Y vectors. The \’b\’ specifies the blue color and the \’*\’ specifies the marker style as an asterisk.

2.d

Option (c) The command std(Z(1:5, :)) calculates the standard deviation for each column in the first five rows of the 10-by-20 matrix Z.

Option (d) The std function can be used to calculate the standard deviation of a matrix, no matter what kind of matrix