5. For a construction project, a large number of bolts in one batch is purchased. It is known from the past experience that the tensile strength of each bolt can be modeled by a lognormal distribution with a mean value of tx = 350 kN and a coefficient of variation of dx = 0.15. In a load test, a bolt is considered to be acceptable if it carries at least 270 kN. What ir the prohn the test?
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
Step by step
Solved in 2 steps
