7. Five mark exercise problems - II

1. A box contains cards numbered \(3\), \(5\), \(7\), \(9\), ...., \(35\), \(37\). A card is drawn at random from the box. Find the probability that the drawn card have either multiples of \(7\) or a prime number.

 

Answer:

 

The required probability is $\frac{i}{i}$

 

2. Three unbiased coins are tossed once. Find the probability of getting atmost \(2\) tails or atleast \(2\) heads.

 

Answer:

 

The probability is $\frac{i}{i}$

 

3. The probability that a person will get an electrification contract is \(\frac{3}{5}\) and the probability that he will not get plumbing contract is \(\frac{5}{8}\). The probability of getting atleast one conract is \(\frac{5}{7}\). What is the probability that a chosen individual from the town is either a female or over \(50\) years?

 

Answer:

 

The required probability is $\frac{i}{i}$