The mean inside diameter of a sample of 300 washers produced by a machine is 0.492 inches and the standard deviation is 0.004 inches. The purpose for which these washers are intended allows a maximum tolerance in the diameter of 0.486 to 0.498 inches, otherwise the washers are considered defective. Determine the percentage of defective washers produced by the machine, assuming the diameters are normally distributed.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

$97520

step-by-step explanation:

add 6% to the value she got from selling the house.

x + 4/7

step-by-step explanation:

use cymath

3x + 4y -25 =0 represents the amount of change sianna should recieve