The file P20_47.xlsx contains the measured diameters (in inches) reported by the production foreman of 500 rods produced by Rodco. A rod is considered acceptable if it is at least 1.0 inch in diameter. In the past the diameter of the rods produced by Rodco has followed a symmetric distribution.

a. Construct a histogram of these measurements.

b. Comment on any unusual aspects of the histogram.

c. Can you guess what might have caused the unusual aspect(s) of the histogram?