Out of 1,00,000 new born babies 77,181 survived till the age of 20. Find the probability that a new baby survives till 20 years of age.

It is 9 to 5 against a person who is 50 years living till he is 70 and 8 to 6 against a person who is 60 years living till he is 80. Find the probability that at least one of them will be alive after 20 years.

Supposing that it is 8 to 7 against a person who is now 30 years of age living till he is 60 and 2 to 1 against a person who is now 40 living till he is 70 , find the probability that at least one of these persons will be alive 30 years hence .

An insuranceagent lives of 5 men,all of the same age and in good health.The probability that a man of this age will survive the next 30 years is known to be 2/3.Find the probability that in the next 30 years atmost three men will survive.

An insurance agent insures lives of 5 men, all of the same age and in good health. The probability that a man of this age will survive tha next 30 years is known to be (2)/(3) . The probability that in the next 30 years at most three men will survive is

Out of 1000 persons born only 800 reach that age of 10, and out of every 1000 who reach the age of 10,850 reach the age 40, out of every thousand who reach the age of 40, 25 die in one year. What is the probability that a person would attain the age of 41?

Four years ago, the average age of a family of four persons was 18 years. During this period, a baby was born. Today if the average age of the family is still 18 years, the age of the baby is (a) 1.2 years (b) 2 years (c) 2.5 years (d) 3 years

There are three persons aged 60,65 and 70 years old.The survival probabilities for these three persons for another 5 years are 0.7,0.4 and 0.2 respectively.What is the probability that at least two of them would survive another five years?