G
Guinness
Guest
The size in mm of a crack in a structural weld is described by a random variable X with the following PDF:
f_X(x) = x/8 for 0<x<=2
= 1/4 for 2<x<=5
= 0 for elsewhere
b) Determine the mean crack size
c) What is the probability that a crack will be smaller than 4mm?
d) Determine the median crack size
e) Suppose there are 4 cracks in the weld. What is the probability that only one of these 4 cracks is larger than 4mm?
Could use some help. Ideas?
f_X(x) = x/8 for 0<x<=2
= 1/4 for 2<x<=5
= 0 for elsewhere
b) Determine the mean crack size
c) What is the probability that a crack will be smaller than 4mm?
d) Determine the median crack size
e) Suppose there are 4 cracks in the weld. What is the probability that only one of these 4 cracks is larger than 4mm?
Could use some help. Ideas?