The National Grid Company is one of several domestic manufacturers of pipe. The quality control department sampled 600 10-foot lengths. At a point 1 foot from the end of the pipe they measured the outsider diameter. The mean was 14.0 inches and the standard deviation 0.1 inches. If the shape of the distribution is not known, at least what percent of the observations will be between 13.85 inches and 14.15 inches? If we assume that the distribution of diameters is symmetrical and bell-shaped, about 95 percent of the observations will be between what two values?

The National Grid Company is one of several domestic manufacturers of pipe. The quality control department sampled XXXXXXXXXXfoot lengths. At a point 1 foot from the end of the pipe they measured the...

The National Grid Company is one of several domestic manufacturers of pipe. The quality control department sampled 600 10-foot lengths. At a point 1 foot from the end of the pipe they measured the outsider diameter. The mean was 14.0 inches and the standard deviation 0.1 inches.

If the shape of the distribution is not known, at least what percent of the observations will be between 13.85 inches and 14.15 inches?

If we assume that the distribution of diameters is symmetrical and bell-shaped, about 95 percent of the observations will be between what two values?

Jun 08, 2022