The probability that a non-leap year should have $53$ Sundays is ............ (in $/7$)

Find the probability that there is a Sunday on $26$ January in any given year.

Over the past $200$ working days,the number of defective parts produced by a machine is given in the following table:

Number of defective parts	$0$	$1$	$2$	$3$	$4$	$5$	$6$	$7$	$8$	$9$	$10$	$11$	$12$	$13$
Days	$50$	$32$	$22$	$18$	$12$	$12$	$10$	$10$	$10$	$8$	$6$	$6$	$2$	$2$

Determine the probability that tomorrow's output will have not more than $5$ defective parts.

$1000$ families with $2$ children were selected randomly,and the following data were recorded:

Number of girls in a family	$0$	$1$	$2$
Number of families	$128$	$672$	$200$

Compute the probability of a family,chosen at random,having $(1)$ two girls,$(2)$ one girl.

Find the probability of getting $51$ marks out of $50$ marks.

$A$ 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 $40$ years or more.