If on an average 9 shops out of 10 return safely to a port, the probability of one ship returns safely is

If on an average 9 shops out of 10 return safely to a port,the probability of one ship does not reach safely is

If on an average 9ships out of 10 arrive safely to ports,find the meen and S.D.of ships returning safely out of a total of 500 ships.

If on an average 9 ships out of 10 arrive safely to ports, find the mean and S.D. of ships returning safely out of a total of 500 ships.

If on an average 1 ship out of 10 do not arrive safely to ports. Find the mean and the standard deviation of the ships returning safely out of a total of 500 ships.

If on an average, out of 10 ships, one is drowned, then what is the probability that out of 5 ships atleast 4 reach safely ?

If on an average 1 ship out of 10 do not arrive safely to parts . Find the mean and the standard deviation of the ships returining safely out of a total of 500 ships .

The probability of any ship return safely to the port is (1)/(5). Find the probability that the returning out of 4 ships,

The probability of any ship return safely to the port is 1/5 . Find the probability that the returning out of 5 ships, at least 3 ships returns safely. It is given that returning ships are independently.

The probability of any ship return safely to the port is 1/5 .Find the probability that the returning out of 5 ships,at least 3 ships returns safely.It is given that returning ships are independently.

One in 9 ships is likely to be wrecked when they are set on a sail. When 6 ships are on sail, find the probability for i) atleast one will arrive safely ii) exactly three will arrive safely.