Experimental Probability Worksheets

**Page 1**

1.

A pair of dice is cast 20 times, and on 2 of these occasions, the sum of the numbers facing up is 5. What is the experimental probability of the outcome 5?

a. | 1 | ||

b. | 0.1 | ||

c. | 0.01 | ||

d. | 10 |

P(outcome 5) =

=

[Simplify.]

Correct answer : (2)

2.

In a blub factory, 1000 bulbs were checked. Out of which 50 were found to be defective. What is the experimental probability a blub is defective?

a. | 6% | ||

b. | 5% | ||

c. | 15% | ||

d. | 2% |

[Simplify.]

The probability of a defective bulb is 5%.

Correct answer : (2)

3.

Annie planted 85 seeds out of which 17 were lemon seeds. Find the experimental probability of not choosing a lemon seed.

a. | $\frac{1}{85}$ | ||

b. | $\frac{1}{9}$ | ||

c. | $\frac{1}{5}$ | ||

d. | $\frac{4}{5}$ |

=

[Substitute and simplify.]

P(no lemon seed) = 1 - P(lemon seed)

= 1 -

[Substitute and simplify.]

Experimental probability of not choosing a lemon seed is

Correct answer : (4)

4.

The table shows the data of the books sold by a bookstore on different subjects during the first week of June. Find the probability of selling a math book.

a. | 8 out of 43 | ||

b. | 25 out of 129 | ||

c. | 44 out of 129 | ||

d. | 12 out of 129 |

[Add the number of books in each subject.]

Number of math books sold = 44

P(math book) =

[Substitute the values.]

The probability of selling a math book is 44 out of 129 .

Correct answer : (3)

5.

Find the probability of getting an odd number, when a number cube is rolled.

a. | 0.6 | ||

b. | 0.5 | ||

c. | 0.4 | ||

d. | 0.71 |

Total number of possible outcomes = numbers on the cube = 6

Probability (getting an odd number) =

=

[Simplify.]

=

[Convert fraction to decimal.]

= 0.5.

[Convert fraction to decimal.]

Correct answer : (2)

6.

Mary rolls a number cube. What is the probability of getting an even number?

a. | 0.5 | ||

b. | 1 | ||

c. | 1.5 | ||

d. | 0.75 |

Total number of events on rolling a number cube = { 1,2,3,4,5,6 } = 6.

Number of favorable events of getting an even number = { 2,4,6 } = 3.

Probability of getting an even number =

[Simplify.]

=

[Convert fraction to decimal.]

= 0.5

Correct answer : (1)

7.

There are 4 blackberries and 5 apples in a bag. If Tom picks a fruit at random from the bag, then what is the probability of the fruit being a blackberry?

a. | 0.25 | ||

b. | 0.32 | ||

c. | 0.49 | ||

d. | 0.44 |

Total number of possible outcomes = number of fruits = 9

=

[Convert fraction to decimal.]

= 0.44

Correct answer : (4)

8.

Use a decimal to express the probability that L is selected from the word UMBRELLA.

a. | 0.75 | ||

b. | 0.25 | ||

c. | 0.5 | ||

d. | 0.65 |

Total number of possible outcomes = number of alphabets = 8

Probability (getting L) =

=

[Simplify.]

=

[Convert fraction to decimal.]

= 0.25

Correct answer : (2)

9.

What is the probability of getting a number, which is a multiple of 4 when the spinner is turned?

a. | 0.75 | ||

b. | 0.50 | ||

c. | 0.35 | ||

d. | 0.25 |

Total number of possible outcomes = Numbers on spinner = 8

Probability (getting a multiple of 4) =

=

[Simplify.]

=

[Convert fraction to decimal.]

= 0.25

Correct answer : (4)

10.

What are the odds in favor of spinning yellow in the figure?

a. | 1 : 4 | ||

b. | 1 : 2 | ||

c. | 3 : 4 | ||

d. | 1 : 1 |

Number of favorable outcomes = 4

[Since there are 4 yellow colored sections in the spinner.]

Number of unfavorable outcomes = 8

[Since there are 8 sections colored other than yellow in the spinner.]

Odds in favor of spinning yellow =

[Substitute and simplify.]

So, the odds in favor of spinning yellow is 1 : 2.

Correct answer : (2)

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