When Probability is strictly less than

[Dwolfson]

When Probability is strictly less than should I compute something like P(X<1) as:

1-P(X<1)^{c} = 1-P(X\geq1)

Thanks,
D

 

[statdad]

Short answer: no, there is no need to do that. Software (or tables, if you still need to use those) will allow you to calculate P(X &lt; 1) and things similar just fine.

 

[chiro]

When Probability is strictly less than should I compute something like P(X<1) as:

1-P(X<1)^{c} = 1-P(X\geq1)

Thanks,
D

When you are dealing with continuous distributions the probability of 1 - P(X < 1) and 1 - P(X <= 1) are treated the same. If the random variable is discrete it will make a difference.