Gujarat BoardĀ GSEB Textbook Solutions Class 8 Maths Chapter 5 Data Handling Ex 5.3 Textbook Questions and Answers.

## Gujarat Board Textbook Solutions Class 8 Maths Chapter 5 Data Handling Ex 5.3

Question 1.

List the outcomes you can see in these experiments?

(a) Spinning a wheel

(b) Tossing two coins together

Solution:

(a) Outcomes is spinning the given wheel are: A, B, C or D.

(b) Outcomes in tossing two coins together are: HT, HH, TH, TT

[where HT ā Head on first coin + Tail on second coin and so on]

Question 2.

When a die is thrown, list the outcome of an event of getting

(i) (a) a prime number (b) not a prime number

(ii) (a) a number greater than 5

(b) a number greater than 5.

Solution:

Possible Out comes are: 1, 2, 3, 4, 5 or 6. Out of them prime numbers are 2,3 and 5.

(i) (a) Outcomes of getting a prime number are: 2, 3 or 5.

(b) Outcomes of getting not a prime number are: 1, 4 or 6

(ii) (a) Outcome of getting a number greater than 5 is 6.

(b) Outcomes of getting a number not greater than 5 are: 1, 2, 3, 4 or 5.

Question 3.

Find:

(a) The probability of the pointer stopping on D in

Spinning a wheel

(b) The probability of getting ace from a well shuffled deck of 52 playing cards?

(c) The probability of getting a red apple. (See figure below)

Solution:

(a) On the spinning wheel there are 5 sectors containing A, B, C and D.

Since, there is only 1 sector containing D.

i.e., possible outcome = 1

Number of equally likely outcomes = 5

ā“ Probability = \(\frac{1}{5}\)

(b) Number of possible outcomes = 52

Since, there are 4 aces in a pack of 52 cards, and out of them one ace can be obtained in 4 ways.

ā“ Equally likely outcomes = 4

ā“ Probability of getting an ace = \(\frac{4}{52}\) = \(\frac{1}{13}\)

(c) There are 7 apples in all

ā“ Possible number of ways = 7

Since, there are 4 red apples. Therefore, a red apple can be obtained in 4 ways.

i.e., Equally likely outcome = 4

ā“ Probability of getting a red apple = \(\frac{4}{7}\)

Question 4.

Numbers 1 to 10 are written on ten separate slips (one number on one slip), kept in a box and mixed well. One slip is chosen from the box without looking into it. What is the probability of:

- getting a number 6?
- getting a number less than 6?
- getting a number greater than 6?
- getting a 1 – digit number?

Solution:

Since, there are 10 slips. At a time any slip can be taken out.

ā“ Number of total outcomes = 10

Now,

1. We can get a slip containing the number ā6ā only once.

ā“ Number of favourable outcome = 1

Thus, probability of getting the number 6 = \(\frac{1}{10}\)

2. There are five numbers (i.e., 1, 2, 3, 4 and 5) which are less than 6.

Favourable outcomes are 5.

ā“ Thus, probability of getting a number less than six = \(\frac{5}{10}\) = \(\frac{1}{2}\)

3. There are 4 numbers (i.e., 7, 8, 9, 10) which are greater than six.

ā“ Favouable outcomes = 4

Thus, probability of getting a number greater than six = \(\frac{4}{10}\) = \(\frac{2}{5}\)

4. There are nine one-digit numbers

i.e., (1, 2, 3, 4, 5, 6, 7, 8 and 9)

ā“ Favourable outcomes = 9

Thus, probability of getting a one-digit number = \(\frac{9}{10}\)

Question 5.

If you have a spinning wheel with 3 green sectors, 1 blue sector and 1 red sector, what is the probability of getting a green sector? What is the probability of getting a non-blue sector?

Solution:

There are 5 sectors in all (3 green + 1 blue + 1 red).

ā“ There are total possible outcomes = 5.

Since, there are 3 green sectors.

i.e., Number of favourable outcomes = \(\frac{3}{5}\)

Thus, probability of getting a green sector = \(\frac{3}{5}\)

Again, there are 4 non-blue sectors.

ā“ Favouable outcomes = 4

Thus, probability of getting a ānon-blueā sector = \(\frac{4}{5}\)

Question 6.

Find the probabilities of the events given in Question 2?

Solution:

There are 6 outcomes in all (i.e., 1, 2, 3, 4, 5, 6)

1. Since, there are 3 prime numbers (i.e., 2, 3, and 5)

ā“ Favourable outcomes = 3

Thus, probability of getting a prime number = \(\frac{3}{6}\) = \(\frac{1}{2}\)

2. Since, there are 3 non-prime numbers (i.e., 1, 4 and 6)

ā“ Favourable outcomes = 1

Thus, the probability of getting a non-prime number = \(\frac{3}{6}\) = \(\frac{1}{2}\)

3. Since, there is 1 number greater than 5 (i.e, 6)

ā“ Favourable outcome = 1

Thus, probability of a number greater than 5 = \(\frac{1}{6}\)

4. Since, there are 5 numbers which are not greater than 5 (i.e, 1, 2, 3, 4 and 5)

ā“ Number of favourable outcomes = 5 Thus, the probability of a number which is not greater than 5 = \(\frac{5}{6}\)