A sign for the local cheese shop is hung by two strings of length 0.25 meters at either end from a 4 meter long pole with a mass of 200 kg. The sign is 2 meters long, has a height of 0.5 meters, and a mass of 700 kg. The owners decide to let the force of friction between the wall and the end of the pole do the work of keeping up the sign. The tie a string to the far right end of the pole, and find that in order to get the pole to stay in place they need to tie the top of the string, at most, at a distance of 0.75 meters above the end of the pole. If the end of the sign si 1 meter from the wall, what is the coefficient of static friction between the wall and the pole?