Common Core: 7th Grade Math : Statistics & Probability

Study concepts, example questions & explanations for Common Core: 7th Grade Math

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Example Questions

Example Question #181 : Statistics & Probability

What is the probability of flipping a coin three times, with the coin landing on heads all three times, and rolling a number on a die other than 

Possible Answers:

Correct answer:

Explanation:

There are two sides to a coin: heads and tails. The probability of the coin landing on heads is 

To determine the probability of the coin landing on heads three times in a row, we take the probability of the coin landing on heads and multiply it three times. 

Based on the question, we want to combine the probability of flipping a coin three times, with the coin landing on heads all three times, with the probability of rolling any number on a die except . There are  sides to a die, and five sides that aren't the number ; thus, the probability of rolling any number on a die except  is 

We want the probability of all of these events occurring, so we need to multiply:

 

Example Question #182 : Statistics & Probability

A student flips a coin four times and rolls a six-sided die. What is the probability that the coin will land on heads all four times and the die will show a ?

Possible Answers:

Correct answer:

Explanation:

There are two sides to a coin: heads and tails. The probability of the coin landing on heads is 

To determine the probability of the coin landing on heads four times in a row, we take the probability of the coin landing on heads and multiply it four times. 

Based on the question, we want to combine the probability of flipping a coin four times, with the coin landing on heads all four times, with the probability of rolling a  on a die. There are  sides to a die, and only one of those sides has the number ; thus, the probability of rolling a  on a die is 

We want the probability of all of these events occurring, so we need to multiply:

 

Example Question #1 : Finding Theoretical Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. What is the theoretical probability of the spinner landing on the orange section? 


1Screen shot 2016 03 03 at 9.49.24 am

Possible Answers:

Correct answer:

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is orange; thus, the theoretical probability of the spinner landing on orange should always be  or 

Example Question #991 : Grade 7

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. What is the theoretical probability of the spinner landing on the yellow section? 

1Screen shot 2016 03 03 at 10.09.46 am

Possible Answers:

Correct answer:

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is yellow; thus, the theoretical probability of the spinner landing on yellow should always be  or 

Example Question #1 : Finding Theoretical Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. What is the theoretical probability of the spinner landing on the green section? 

1Screen shot 2016 03 03 at 10.09.46 am

Possible Answers:

Correct answer:

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is green; thus, the theoretical probability of the spinner landing on green should always be  

Example Question #2 : Finding Theoretical Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. Is the experimental probability of landing on pink more likely, less likely, or equally likely in comparison to the theoretical probability? 

1Screen shot 2016 03 03 at 9.14.25 am

 

Possible Answers:

Equally likely 

More likely 

Results can't be found based on the data provided 

Less likely 

Correct answer:

More likely 

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is pink; thus, the theoretical probability of the spinner landing on pink should always be 

The experimental probability is what actually happened in an experiment. In this case, Kelly spun the spinner  times, and she landed on pink  times; thus, our experimental probability is 

In order to compare the theoretical probability and the experimental probability let's convert the fractions into decimals so we can put them on a number line:

2

A probability closer to  means that an event is more likely to occur. In this case,  is closer to ; thus, the experimental probability is more likely than the theoretical probability. 

Example Question #1 : Finding Theoretical Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. Is the experimental probability of landing on orange more likely, less likely, or equally likely in comparison to the theoretical probability? 

1Screen shot 2016 03 03 at 9.49.24 am

Possible Answers:

Results can't be found based on the data provided 

Less likely 

More likely 

Equally likely 

Correct answer:

More likely 

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is orange; thus, the theoretical probability of the spinner landing on orange should always be  or 

The experimental probability is what actually happened in an experiment. In this case, Kelly spun the spinner  times, and she landed on orange  times; thus, our experimental probability is 

In order to compare the theoretical probability and the experimental probability let's convert the fractions into decimals so we can put them on a number line:

2

A probability closer to  means that an event is more likely to occur. In this case,  is closer to ; thus, the experimental probability is more likely than the theoretical probability. 

Example Question #1 : Finding Theoretical Probability

Kelly spun a spinner, which is pictured below,  times. The spinner had six equally-sized sections, each of a different color, and she recorded her results in the table provided. What is the theoretical probability of the spinner landing on the pink section? 

1Screen shot 2016 03 03 at 9.14.25 am

Possible Answers:

Correct answer:

Explanation:

The theoretical probability is what should happen. In this case, we have  spaces and  of those spaces is pink; thus, the theoretical probability of the spinner landing on pink should always be 

Example Question #1 : Finding Experimental Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. What is the experimental probability of the spinner landing on the pink section? 

1Screen shot 2016 03 03 at 9.14.25 am

 

Possible Answers:

Correct answer:

Explanation:

The experimental probability is what actually happened in an experiment. In this case, Kelly spun the spinner  times, and she landed on pink  times; thus, our experimental probability is 

Example Question #1 : Finding Experimental Probability

Kelly spun a spinner, which is pictured below,  times. She recorded her results in the table provided. What is the experimental probability of the spinner landing on the orange section? 


1Screen shot 2016 03 03 at 9.49.24 am

Possible Answers:

Correct answer:

Explanation:

The experimental probability is what actually happened in an experiment. In this case, Kelly spun the spinner  times, and she landed on orange  times; thus, our experimental probability is 

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