Prabability class IX

In a cricket match, a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary.

• 1/5

• 1/6

• 3/5

• 4/5

Three coins are tossed simultaneously 200 times with the following frequencies of different outcomes.If the three coins are simultaneously tossed again, compute the probability of 2 heads coming up.

• 9/50

• 9/25

• 77/200

• 95/100

The blood groups of some students of Class IX were surveyed and recorded as below :

If a student is chosen at random, find the probability that he/she has blood group A or AB.

• 11/25

• 38/40

• 16/25

• 32/50

A group of 80 students of Class X are selected and asked for their choice of subject to betaken in Class XI, which is recorded as below :

If a student is chosen at random, find the probability that he/she is a student of either commerce or humanities stream.

• 12/80

• 21/80

• 33/80

• 18/80

A dice is rolled number of times and its outcomes are recorded as below:

Find the probability of getting an odd number.

• 35/250

• 69/125

• 103/250

• 69/250

Three coins are tossed simultaneously 150 times with the following frequencies of different outcomes :Compute the probability of getting at least 2 tails

• 32/150

• 62/150

• 95/150

• 25/150

Three coins are tossed simultaneously 150 times with the following frequencies of different outcomes :Compute the probability of getting Exactly one tail.

• 1/5

• 2/5

• 30/150

• 1/4

Books are packed in piles each containing 20 books. Thirty five piles were examined for defective books and the results are given in the following table :

One pile was selected at random. What is the probability that it has more than 4 defective books ?

• 13/700

• 8/700

• 11/700

• 31/700

Books are packed in piles each containing 20 books. Thirty five piles were examined for defective books and the results are given in the following table :

One pile was selected at random. What is the probability that it has more than 0 but less than 4 defective books ?

• 257/700

• 118/700

• 206/700

• 269/700

An insurance company selected 2000 drivers at random (i.e., without any preference of one driver over another) in a particular city to find a relationship between age and accidents. The data obtained are given in the following table :Find the probability of the following events for a driver-selected at random from the city : being 18 – 29 years of age and having exactly 3 accidents in one year.

• 60/2000

• 20/2000

• 70/2000

• 28/2000