Experimental Approach to Probability

Q.

250 students of class X of a school appeared in a test of 100 marks and the data about the marks secured is as below.$$\begin{array}{cccccc}Markssecured& 0-20& 21-40& 41-60& 61-80& 81-100\\ Numberofstudents& 20& 35& 65& 60& 70\end{array}$$

Find the probability of selecting at random, a student who scored

(i) not more than 40
(ii) more than 60
(iii) more than 80 [ 2 MARKS ]

Q.

The probability of getting a composite number in a throw of dice is ___.

1. 1/2

2. 1

3. 1/3

4. 1/6

Q.

When two dice are thrown simultaneously, the probability of getting a sum of 12 is ___.

1. 1/6

2. 1/12

3. 1/36

4. 1/3

Q.

If you roll a die, what is the probability of getting a number greater than 2?

1. Two Out Of Three Rolls
2. Two Out Of Four Rolls
3. One Out Of Three Rolls
4. Three Out Of Four Rolls

Q.

The probability of getting both head and tail in one throw of a coin is ___.

1. 1/2

2. 1/3

3. 1

4. 0

Q.

Four friends named Ravi, Suresh, Rani, Geetha put their names in a box. A name is picked at random. The probability of getting a boy's name is $\frac{1}{4}$.

1. False

2. True

Q. Probability of getting a head when a coin is tossed is ___.

1. $\frac{1}{3}$

2. $0$

3. $1$

4. $\frac{1}{2}$

Q.

In a box containing 18 balls of 3 different colours red, green and blue, if 10 are red and 4 are green, then what is the probability of getting a blue ball in the first attempt?

1. $\frac{1}{2}$

2. $\frac{2}{9}$

3. $\frac{1}{3}$

4. $\frac{1}{4}$

Q.

When two dice are thrown , the probability of getting a sum of 6 is ___________

1. $\frac{1}{36}$

2. $\frac{5}{12}$

3. $\frac{5}{36}$

4. $\frac{1}{3}$

Q.

48 ice-creams are placed on a table. Some are chocolate flavoured and others are vanilla flavoured. If a person takes an ice-cream at random from the table, the probability that it is chocolate flavoured is $\frac{2}{3}$. Find the number of vanilla flavoured ice-creams on the table.

1. 8

2. 24

3. 16

4. 32