Q12 of 55 Page 623

Two coins are tossed 1000 times and the outcomes are recorded as under:

Number of heads

2

1

0

Frequency

266

540

194

A coin is thrown at random. What is the probability of getting at most one head?

Total number times a coin is tossed = 1000

Number of times no heads occurred = 194

Number of times one head occurred = 540

Number of times two head occurred = 266

Probability P() =

Probability of getting at most one head is

P(at most one head) = = = =

In 65 thrown of a die, the outcomes were noted as under:

Outcome	1	2	3	4	5	6
Number of times	8	10	12	16	9	10

A die is thrown at random. What is the probability of getting a prime number?

On one page of a directory, there are 160 telephone numbers. The frequency distribution of the unit place digit is given as under:

Units place digit	0	1	2	3	4	5	6	7	8	9
Frequency	19	16	18	21	14	11	15	16	13	17

From this page, one of the numbers is chosen at random. What is the probability that the unit place digit in the chosen number is 6?

80 bulbs are selected at random from a lot and their lifetime is recorded in the from of a frequency table given below:

Lifetimes(in hours)	300	500	700	900	1100
Frequency	10	15	23	25	7

A bulb is chosen at random from the lot. What is the probability that the bulb chosen has lifetime less than 900 hours?

In a medical examination of 40 students of a class, the following blood, groups are recorded:

Blood group	A	B	AB	O
No of students	11	15	9	5

From this class, a student is chosen at random, What is the probability that the chosen student has blood group B?

Two coins are tossed 1000 times and the outcomes are recorded as under:Number of heads210Frequency266540194A coin is thrown at random. What is the probability of getting at most one head?