Fuses are known to be normally distributed with a mean failing current of 2 A and a standard deviation of 150 mA (a) Calculate the percentage of the fuses expected to fail at a value greater than 2·3 A (b) Determine the value, to the nearest milliamp, above which 90·3% of the fuses would be expected to fail (c) The fuses are considered to be within tolerance if they have a failure value lying in the range 2 A + / - 220 mA. What percentage of components are likely to be rejected for being out of tolerance?
Fuses are known to be
(a) Calculate the percentage of the fuses expected to fail at a value greater than 2·3 A
(b) Determine the value, to the nearest milliamp, above which 90·3% of the fuses
would be expected to fail
(c) The fuses are considered to be within tolerance if they have a failure value lying in the range 2 A + / - 220 mA. What percentage of components are likely to be rejected for being out of tolerance?
(d) State the 99% confidence limits for the components
(e) The board of directors have stated that their expectation of this component is that no more than 3% should be rejected for being out of tolerance, what would be your recommendations to the board with regards to your findings?
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