Rajesh has just bought a VCR from Maharashtra Electronics and the shop offers after sales service contract for Rs. 1000 for the next five years. Considering the experience of VCR users, the following distribution of maintenance expenses for the next five years is formed.

The expected value of maintenance cost is :

If $$X \sim B(4, p)$$ and $$P(X=0)=\frac{16}{81}$$, then $$P(X=4)=$$

The odds in favour of getting sum multiple of 3 , when pair of dice are thrown is

If $X$ is a.r.v. with c.d.f $F(x)$ and its probability distribution is given by

then, $F(1.5)-F(-0.5)=$