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Estimate the mttf and the standard deviation

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Reference no: EM132416620

Three hundred electric motors were originally installed in 1974 as part of a machine assembly. they have all failed. the following data were collected over their operating history,

Year -1975,1976,1977,1978,1979,1980,1981,1982,1983

Number of failure:- 15,20,18,27,35,31,45,43,43

Derive an empirical function, density function, and hazard function for these motors. Estimate the MTTF and the standard deviation of the failures times. Also conclude that the failure rate is decreasing, constant, or increasing

Reference no: EM132416620

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