In a packet of $500$ screws,$80$ screws are defective. Find the probability that a screw selected at random from the packet is non-defective. (in $/25$)

$A$ card is drawn at random from a well-shuffled pack of $52$ cards. The probability of that card being a jack is $\ldots \ldots \ldots$

$A$ school has five houses $A, B, C, D$ and $E$. $A$ class has $23$ students: $4$ from house $A$,$8$ from house $B$,$5$ from house $C$,$2$ from house $D$,and the rest from house $E$. $A$ single student is selected at random to be the class monitor. The probability that the selected student is not from house $A, B$,or $C$ is: (in $/23$)

$A$ card is selected at random from a well-shuffled pack of $52$ cards. Find the probability that the selected card is that of spades.

Which of the following cannot be the probability of an event?

An unbiased coin is tossed thrice. The probability of receiving more heads than tails is ........