Identifying Equally Likely Outcomes-Gr 7-Solved Examples

Solved Examples and Worksheet for Identifying Equally Likely Outcomes

Q1Choose whether the event is likely, unlikely or equally likely to occur. "I will be taller this year than the coming year."
A. a likely event
B. an unlikely event
C. an equally likely as unlikely event
D. none of these

Solutions

Step: 1

The event will not happen.

Step: 2

So, it is an unlikely event.

Correct Answer is : an unlikely event

Q2Choose whether the event is likely, unlikely or equally likely to occur. "Your mom and dad will go on a vacation."
A. a likely event
B. an unlikely event
C. an equally likely event
D. an impossible event

Solutions

Step: 1

The event is just as likely to happen as not to happen.

Step: 2

So, it is an equally likely event.

Correct Answer is : an equally likely event

Q3When the spinner is spun, on which number do you think the spinner is least likely to stop on?

A. 2
B. 3
C. 1
D. None of these

Solutions

Step: 1

The yellow colored sector which is numbered as 3 has the minimum area.

Step: 2

So, the spinner has a chance that most likely to stop on 3.

Correct Answer is : 3

Q4How many outcomes are possible when both the spinners are spinned simultaneously?

A. 6
B. 1
C. 3
D. 2

Solutions

Step: 1

A possible outcome is something that has a chance of happening.

Step: 2

The possible outcomes are (B, G), (B, Y), (B, P), (W, G), (W, Y) and (W, P).

Step: 3

So, there are 6 possible outcomes when both the spinners are spinned simultaneously.

Correct Answer is : 6

Q5If a spinner is spun on a number, then which of the spinners has the probability of all the outcomes being equal?

A. Spinner 1
B. Spinner 4
C. Spinner 3
D. Spinner 2

Solutions

Step: 1

The spinner 1 is divided into 12 equal parts.

Step: 2

The spinner 2 is divided into 8 unequal parts.

Step: 3

The spinner 3 is divided into 8 unequal parts.

Step: 4

The spinner 4 is divided into 5 unequal parts.

Step: 5

So, spinner 1 has the probability of all the outcomes being equal.

Correct Answer is : Spinner 1

Q6If you roll a six-sided number cube, how many equally likely outcomes are there?

A. 3
B. 1
C. 2
D. 6

Solutions

Step: 1

In probability, when there are the same chances of more than one event to happen, the events are equally likely to occur.

Step: 2

When we roll a six sided cube, the equally likely outcomes are 1, 2, 3, 4, 5, 6.

Step: 3

So there are 6 equally likely outcomes.

Correct Answer is : 6

Q7Which of the following experiments have equally likely outcomes?

A. Choosing a yellow marble from a bag of 2 red marbles and 5 yellow marbles.
B. Choosing a red crayon from a box of 5 red crayons.
C. Choosing a letter at random from the word CANDY.

Solutions

Step: 1

Choosing a red crayon from a box of 5 red crayons.

Step: 2

P(Red Crayon) = 15

Step: 3

This event have no equally likely outcomes.

Step: 4

Choosing a yellow marble from a bag of 2 red marbles and 5 yellow marbles.

Step: 5

Then, P(Marble) = 17, P(Red Marble) = 27, P(Yellow Marble) = 57

Step: 6

This event have no equally likely outcomes.

[Since their probabilities are not equal.]

Step: 7

Choosing a letter at random from the word CANDY.

Step: 8

Then, P(C) = 15, P(A) = 15, P(N) = 15, P(D) = 15, P(Y) = r-0n=1d=5

Step: 9

This event have equally likely outcomes.

[Since their probabilities are equal.]

Step: 10

So, among the choices listed, Choosing a letter at random from the word CANDY have equally likely outcomes.

Correct Answer is : Choosing a letter at random from the word CANDY.

Q8Identify the statement where the probabilities of all outcomes are equal.
A. The probability of getting an odd number is the same as the probability of getting an even number on the number cube.
B. The probability of getting an odd number is the same as the probability of getting a number zero on the number cube.
C. The probability of getting an odd number on the number cube is the same as the probability of getting a head when a coin is tossed.

Solutions

Step: 1

The probability of getting an odd number on the number cube will not be same as the probability of getting a head when a coin is tossed.

Step: 2

The probability of getting an odd number will not be same as the probability of getting a number zero on the number cube.

Step: 3

The probability of getting a sum of 5 is the same as the probability of getting an even number on the number cube.

Step: 4

The probability of getting an odd number is the same as the probability of getting an even number on the number cube.

Step: 5

So, "The probability of getting an odd number is the same as the probability of getting an even number on the number cube" is the statement where the probabilities of all outcomes are equal.

Correct Answer is : The probability of getting an odd number is the same as the probability of getting an even number on the number cube.

Q9If a spinner is spun on a color, then which of the spinner has the probability of all the outcomes being equal.

A. Spinner 2.
B. Spinner 3
C. Spinner 1.

Solutions

Step: 1

Consider Spinner 1.

Step: 2

P(B) = 3, P(G) = 2, P(Y) = 1, P(W) = 2. So, this event has no equally likely outcomes.

[Since the probabilities are not equal.]

Step: 3

Consider Spinner 2.

Step: 4

P(Y) = 2, P(G) = 4, P(B) = 2. So, this event has no equally likely outcomes.

[Since the probabilities are not equal.]

Step: 5

Consider Spinner 3.

Step: 6

P(B) = 1, P(G) = 1, P(Y) = 1. So, this event has equally likely outcomes.

[Since the probabilities are equal.]

Step: 7

So, Spinner 3 has the probability of all the outcomes being equal.

[Since the probabilities are not equal.]

Correct Answer is : Spinner 3

Q10Which of the following experiments have no equally likely outcomes?
A. Choosing a letter from the word MATHEMATICS
B. Choosing a letter from the word SCIENCE.
C. Choosing a pen from 7 blue and 9 red pens.
D. All the above

Solutions

Step: 1

Choose a letter from the word "MATHEMATICS".

Step: 2

P(M) = 211, P(A) = 211, P(T) = 211,P(H) = 111, P(E) = 111, P(I) = 111, P(C) = 111, P(S) = 111.

Step: 3

This event has no equally likely outcomes.

[Since the probabilities are not equal.]

Step: 4

Choose a letter from the word "SCIENCE".

Step: 5

P(S) = 17, P(C) = 27, P(I) = 17, P(E) = 27, P(N) = 17.

Step: 6

This event has no equally likely outcomes.

[Since their probabilities are not equal.]

Step: 7

Choose a pen from 7 blue and 9 red pens.

Step: 8

P(Pen) = 116, P(Red Pen) = 916, P(Blue Pen) = 716.

Step: 9

This event has no equally likely outcomes.

[Since their probabilities are not equal.]

Step: 10

So, all of the above experiments have no equally likely outcomes.

Correct Answer is : All the above

Solved Examples and Worksheet for Identifying Equally Likely Outcomes

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