Algebra II : Algebra II

Study concepts, example questions & explanations for Algebra II

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Example Questions

Example Question #332 : Data Properties

Determine the mode of the numbers:  

Possible Answers:

Correct answer:

Explanation:

The mode is defined as the number or numbers that occur the most in the data set.

The only number that appears more often than the other numbers given is the value of .

This means that the mode is .

The answer is:  

Example Question #333 : Data Properties

The 2014 Sinquefield Cup consisted of nine total rounds. In this chess tournament, a win is worth one point, a draw is worth half a point, and a loss is worth no point. At the end of the tournament, the player with the highest score wins the tournament. Below are the scores of the players.

 

Sinquefield

Find the mode of the scores.

Possible Answers:

There is no mode.

Correct answer:

Explanation:

To find the mode of the terms, you must find the term that is repeated the most.

 

Since  is listed twice, and none of the other scores are listed more than once, you can determine that the mode of the scores is .

 

Solution: 

Example Question #332 : Data Properties

What is the mode of the following set of numbers:

Possible Answers:

Correct answer:

Explanation:

The mode of a set of numbers is the number that occurs most frequently,

in this case it is

Example Question #1 : Statistical Concepts

The number of runs scored per game by a little league baseball team is represented by the following frequency distribution:

Number of Runs Scored Frequency
0 5
1 2
2 7
3 9
4 3
5 0
6 4
7 2
8 2
9 1

Using this frequency table, select the correct answer of mean runs scored by the little league team (rounded to the nearest hundredth).

Possible Answers:

There's not enough information present to determine the mean.

Correct answer:

Explanation:
Number of Runs Scored Frequency
0 5
1 2
2 7
3 9
4 3
5 0
6 4
7 2
8 2
9 1

To determine the mean, first the data set should be re-written in sequential order:

 

The formula to determine mean is:

The mean is approximately 3.37 runs scored per game.

 

 

Example Question #2 : Statistical Concepts

Thousands of people in the United States were surveyed about their grandparents. This frequency table shows their answer to the question "how many of your grandparents were born outside of the US?

Frequency table a

Of the people who had at least one grandparent born outisde of the US, what percent had exactly 3 non-US born grandparents? 

Possible Answers:

Correct answer:

Explanation:

Adding up the total number of grandparents that were born outside the U.S. is our first step in solving this problem.

There are 

people who said they had at least 1 grandparent born outside of the US. Of those, only 976 had exactly 3.

So 

 or  is the answer.

Example Question #3 : Statistical Concepts

Thousands of people in the United States were surveyed about their grandparents. This frequency table shows their answer to the question "how many of your grandparents were born outside of the US?"

Frequency table a

Is this data normally distributed?

Possible Answers:

Partly

Yes

No

Need more information

Correct answer:

No

Explanation:

No - normally distributed data has a low frequency of responses at the high and low ends. Also, the majority of the data is in the middle.

In this data set, the majority of people said "0," and the fewest people said "3" which is near the middle of the data. If this data was normally distributed we would have a higher frequency between 1 and 3 and much lower values for 0 and 4.

Example Question #2 : Frequency Distributions

What is the correct frequency distribution for this data set?

1   3   5   2   5   2   4   1   5  
2   4   1   2   3   5   5   2   3
3   1   4   4   6   2   3   2   4

Possible Answers:


Correct answer:

Explanation:

Count the number of times each number appears in the data set.

The number 1 appears 4 times, so the first line is .

Then number 2 appears 7 times, so the next line is .

Continuing in this fashion we see that the numbers 3, 4, and 5 appears 5 times and 6 appears once.

Therefore combining these together we get the following answer:

Example Question #1 : Statistical Concepts

What is the mean of the data in this frequency table?

#   Frequency
1    3
2    4
3    0
4    2

Possible Answers:

Correct answer:

Explanation:

The frequency table represents the data set:

1, 1, 1, 2, 2, 2, 2, 4, 4.

The sum is 19 and there are 9 data points, so the mean is

.

Example Question #4 : Statistical Concepts

What is the median of the data in this frequency table?

#   Frequency
1    3
2    4
3    0
4    2

Possible Answers:

Correct answer:

Explanation:

The frequency table represents the data set:

1, 1, 1, 2, 2, 2, 2, 4, 4.

The median is 2 because 4 data points appear before and after the center 2.

Example Question #2 : Statistical Concepts

Which frequency table has a median of 5? (The first column represents the data points, the second column the frequency)

Possible Answers:

Correct answer:

Explanation:

The correct frequency table represents the data set 3, 4, 5, 5, 6, 6, 8.

 

Since there are 7 data points our median will be the 4th spot which makes the value 5. It occures at the 4th spot because at that spot half the data points are below it while the other half are above it.

The center number of that data set is 5 as required.

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