Mohon diberikan petunjuk ya kakak-kakak. Dari pengalaman selama ini, suatu perusahaan penerbangan memastikan bahwa rata-rata berat bagasi yang dibawa oleh penumpang untuk rute Jakarta – Surabaya adalah 20 kg dengan simpangan baku 5 kg dan terdistribusi normal. Pesawat selalu terisi penuh dengan 100 penumpang. Pilot pesawat akan meminta tambahan bahan bakar ekstra sebesar 125 kg apabila total bagasi penumpang melebihi 2075 kg. Berapa peluang bahwa pesawat membutuhkan bahan bakar ekstra?

i got 86 for this

hope this !

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when a figure, such as triangle (xyz) is reflected over the line y = x to create x'y'z' the x-coordinates and y-coordinates of the original image (pre-image) will be reversed for the image. (e.g., (x, y) > (y, x)) this means that the pre-image position of the x- and y-coordinates switch places which in turn provides a mirror like image of the original xyz.  

i notice that when i draw a line segment from x to x', that the points are parallel from each other -- they are exactly across from each other and do not intersect with any other points.  

yes, think i would see the same characteristic if you drew the line segment connecting y with the reflecting line and then y' with the reflecting line because of the essence of reflections. because it is a mirror image, each point was effected the same way which leads me to conclude that they same would apply to y and y'.