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melody12chocolatemil
27.11.2019 •
Mathematics
The quality control manager of a tire company wishes to estimate the tensile strength of a standard size of rubber used to make a class of radial tires. a random sample of 49 pieces of rubber from different production batches is subjected to a stress test. the test measures the force needed to break the rubber in pounds. according to the sample results, the average pressure is 250 pounds and the standard deviation is 42 pounds. determine the 95% confidence interval.
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Ответ:
Step-by-step explanation:
From what I can come up with with no actual factual information is that the equation is
and the FOIL out those terms inside the square brackets:
and distribute again on both sides to get rid of the brackets entirely:
and combining like terms cancels a lot of that out to leave:
Solving the first:
x = 0 + 2kπ and solving the second one:
So x = 0 + 2kπ
and I really hope that's what you were looking for!