(ii) A manufacturing facility buys springs to use in an assembly. The specification requires the "rate", i.e. the force

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Ii A Manufacturing Facility Buys Springs To Use In An Assembly The Specification Requires The Rate I E The Force 1 (39.36 KiB) Viewed 64 times

(ii) A manufacturing facility buys springs to use in an assembly. The specification requires the "rate", i.e. the force required to compress the spring by one centimetre, to be 44.5 Newtons – 2 Newtons. A sample of one hundred springs was selected and the rate was measured using a standard test rig, with the results shown in below. Mean = 44.38644 Variance = 1.1752 Distribution - Normal لي a) Given that the distribution is normal, what proportion of all springs would be expected to lie outside the specification? b) From the sample, show whether or not the population mean is on target? c) Estimate the population mean with 95% confidence. (a/b/c 5 marks each)