In a hospital, there are 20 kidney dialysis machines and that the chance of any one of them to be out of service during a day is 0.02. Determine the probability that exactly 3 machines will be out of service on the same day.

The probability that a bulb produced in a factory will fuse after 150 days of use is 0.05 Find the probability that out of 5 such bulb : Not more than one will fuse after 150 days of use.

The probability that a bulb produced in a factory will fuse after 150 days of use in 0.05. Find the probability that out of 5 such bulbs: (ii) Not more than one will after 150 days of use.

The probability that a bulb produced in a factory will fuse after 150 days of use is 0.05 Find the probability that out of 5 such bulb : More than one will fuse after 150 days of use.

The probability that a bulb produced in a factory will fuse after 150 days of use in 0.05. Find the probability that out of 5 such bulbs: (iii) More than one will fuse after 150 days of use.

The probability that a bulb produced in a factory will fuse after 150 days of use in 0.05. Find the probability that out of 5 such bulbs: (iv) At least one will fuse after 150 days of use.

The probability that a bulb produced in a factory will fuse after 150 days of use is 0.05 Find the probability that out of 5 such bulb : At least one will fuse after 150 days of use.

In an automobile factory, certain parts are to be fixed into the chassis in a section before it moves into another section. On a given day, one of the three persons A, B and C carries out this task. A has 45% chance, B has 35% chance and C has 20% chance of doing the task. The probability that A, B and C will take more than the allotted time is (1)/(6), (1)/(10) and (1)/(20) respectively. If it is found that the time taken is more than the allotted time, what is the probability that A has done the task ?

The same 20 contestants, on each of 3 days, answered 5 questions in order to win a prize. Each contestant received 1 point for each correct answer. The number of contestants receiving a given score on each day is shown in the table above. No contestant received the same score on two different days. If a contestant is selected at random, what is the probability that the selected contestant received a score of 5 on Day 2 or Day 3, given that the contestant received a score of 5 on one of the three days?

A study was conduced to find out the concentration of sulphur dioxide in the air in parts per million (ppm) of a certain city. The data obtained for 30 days is as follow: {:("0.03 0.08 0.08 0.09 0.04 0.17"),("0.16 0.05 0.02 0.06 0.18 0.20"),("0.11 0.08 0.12 0.13 0.22 0.07"),("0.08 0.01 0.10 0.06 0.09 0.18"),("0.11 0.07 0.05 0.07 0.01 0.04"):} You were asked to prepare a frequency distribution table, regarding the concentration of sulphur dioxide in the air in parts per million of a certain city for 30 days. Using this table, find the probability of the concentration of sulphur dioxide in the interval 0.12-0.16 on any of these days.