80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under

One bulb is selected at random from the lot . What is the probability that the selected bulb has a life more than 500 hours ?

80 bulbs are selected at random from a lot and their lifetime in hours is recorded as under : One bulb is selected at random from the lot . What is the probability that its life is 1150 hours ?

80 bulbs are selected at random from a lot and their time (in hours) is recorded in the form of a frequency table given below One bulb is selected at random from the lot. The probability that its life is 1150 h , is

80 bulbs are selected at random from a lot and their time (in hours) is recorded in the form of a frequency table given below One bulb is selected at random from the lot. The probability that its life is 1150 h, is

80 bulbs are selected at random from a lot and their life time (in hours) is recorded in the form of a frequency table given below. Find the probability that bulbs selected randomly from the lot has life less than 900 hours.

80 batteries are selected at random from a lot and their lifetime is recorded in the form of a frequency table given below: A battery is chosen at random from the lot. What is the probability that it has lifetime which is perfect square of a natural number?

A lot of 25 bulbs contain 5 defective ones. One bulb is drawn at random from the lot. What is the probability that the bulb is good.

A lot of 25 bulbs contain 5 defective ones. One bulb is drawn at random from the lot. What is the probability that the bulb is good.

A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at random from the lot. What is the probability that the bulb is defective?

A lot of 20 bulbs contain 4 defective ones. One bulbs is drawn at random from the lot. What is the probability that this bulb is defective?

A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?