Final answer:
The question addresses the materials screws are made from and involves solving problems related to the mean diameter and distribution of screw sizes, which relates to Mathematics and, in particular, to concepts of statistics and probability.
Step-by-step explanation:
The question revolves around the characteristics and measurements of screws, which involves mathematical calculations and concepts.
Firstly, with regard to the types of metals screws could be made from, it's important to note that screws can be manufactured from various metals such as steel, stainless steel, brass, and aluminum, among others. The actual metal used would depend on the screw's intended use and required properties, such as corrosion resistance or strength.
Regarding the second part of the question about the Screw Right Company, if the company claims their inch screws are within ±0.23 of the claimed mean diameter of 0.750 inches with a standard deviation of 0.115 inches, this implies that most of the screws produced by the company fall within this range.
The distribution of the diameters of these screws can be assumed to be normal due to the given standard deviation.
Finally, answering question 90, if X represents the diameter of one screw and the manufacturer makes screws with a mean diameter of 0.15 cm with a uniform distribution within the range of 0.10 cm to 0.20 cm, then the distribution of X is a uniform distribution.
For question 91, when repeatedly drawing samples of size 100 and calculating their mean, the distribution of these sample means would approximate a normal distribution according to the central limit theorem, regardless of the shape of the underlying population distribution.