The probability of getting two heads when three balanced coins are tossed is ............

$A$ recent survey found that the ages of workers in a factory is distributed as follows:

Age (in years)	$20-29$	$30-39$	$40-49$	$50-59$	$60$ and above
Number of workers	$38$	$27$	$86$	$46$	$3$

If a person is selected at random,find the probability that the person is under $60$ but over $39$ years.

In cricket,Rohit hits a century in $4$ innings out of $10$ innings. Find the probability that he did not hit a century.

Two dice are thrown simultaneously $500$ times. Each time the sum of two numbers appearing on their tops is noted and recorded as given in the following table:

Sum	Frequency
$2$	$14$
$3$	$30$
$4$	$42$
$5$	$55$
$6$	$72$
$7$	$75$
$8$	$70$
$9$	$53$
$10$	$46$
$11$	$28$
$12$	$15$

If the dice are thrown once more,what is the probability of getting a sum between $8$ and $12\,?$

As the number of tosses of a coin increases,the ratio of the number of heads to the total number of tosses will be $\frac{1}{2}$. Is it correct? If not,write the correct one.

An insurance company selected $1600$ drivers at random in a particular city to find a relationship between age and accidents. The data is as below:

Age group of drivers	Number of accidents in one year $(0, 1, 2, 3, >3)$
$18-25$	$320, 125, 75, 45, 30$
$25-40$	$400, 45, 50, 15, 10$
$40-55$	$150, 85, 13, 8, 10$
Above $55$	$150, 25, 17, 20, 7$

Find the probability of the following event for a driver selected at random from the city: being $25-40$ years of age and having exactly $2$ accidents in a year.