Continuous Distributions Practitioner's Exam

<%@ LANGUAGE = VBScript %> <% response.expires=0 Dim corcnt corcnt=0%> Continuous Distributions Practitioner's Exam - Question 11

	Continuous Distributions Expert's Exam

Given that a population of components has a lognormal time to fail distribution with a mean of 400 hours and a standard deviation of 60 hours, if 200 components are tested for 430 hours, what is the expected number of survivors?
61.7
31.7
28.3
None of the above
Given the following probability density function, determine the mean and variance.

2, 0.4
0.4, 2
17.3, 22.85
None of the above
A component has a Weibull time to fail distribution with a shape parameter of 4, a scale parameter of 50 and a location parameter of 10. Given the component survives until time = 60 and fails before time = 80, what is the probability of the component surviving until time = 75?
0
0.244
0.519
None of the above
What is the value of the exponential probability density function at the intersection with the y-axis?
0
l
q
none of the above