What is the service life associated with a probability of 0.10, with a

What is the service life associated with a probability of 0.10, with a mean of 20 months and a standard deviation of 2 months?

What is the service life associated with a probability of 0.10, with a

What is the service life associated with a probability of 0.10, with a mean of 20 months and a standard deviation of 2 months?