The lifetime, in drilling hours, of a particular type of drill bit is well modelled by a Weibull distribution with parameters a = 2.1 and B= 3.6 (c) () Calculate the probability that the lifetime of a randomly chosen drill bit is between 4 hours and 5 hours. (ii) Calculate the mean and standard deviation of the drill bit lifetime.

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The lifetime, in drilling hours, of a particular type of drill bit is well
modelled by a Weibull distribution with parameters a = 2.1 and B=3.6
(c)
(i)
Calculate the probability that the lifetime of a randomly chosen
drill bit is between 4 hours and 5 hours.
(ii)
Calculate the mean and standard deviation of the drill bit lifetime.
Transcribed Image Text:The lifetime, in drilling hours, of a particular type of drill bit is well modelled by a Weibull distribution with parameters a = 2.1 and B=3.6 (c) (i) Calculate the probability that the lifetime of a randomly chosen drill bit is between 4 hours and 5 hours. (ii) Calculate the mean and standard deviation of the drill bit lifetime.
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