3. The continuous random variable \(X\) is uniformly distributed over the interval \([ - 1,3 ]\). Find
- \(\mathrm { E } ( X )\)
- \(\operatorname { Var } ( X )\)
- \(\mathrm { E } \left( X ^ { 2 } \right)\)
- \(\mathrm { P } ( X < 1.4 )\)
A total of 40 observations of \(X\) are made.
- Find the probability that at least 10 of these observations are negative.