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The length of life of an instrument produced by a machine has a normal distribution with a mean of 9.4 months and a standard deviation of 3.2 months. What is the probability that an instrument produced by this machine will last between 6 and 11.6 months?(a) 0.642(b) 0.4098(c) 0.16(d) 0.326I got this question in my homework.I want to ask this question from Probability Distribution in portion Discrete Probability of Discrete Mathematics

Answer»

The CORRECT option is (d) 0.326

The EXPLANATION: We have to FIND P(6 < X < 11.6). Now, for x = 6, z becomes -1.062 and for z = 11.6, z = 0.687. So, P(6 < x < 11.6) = P(-1.062 < z < 0.687) = 0.326.



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