ISEE Upper Level Quantitative : ISEE Upper Level (grades 9-12) Quantitative Reasoning

Study concepts, example questions & explanations for ISEE Upper Level Quantitative

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Example Questions

Example Question #3 : How To Find Mode

Consider the data set

,

where  is unknown.

Which is the greater quantity?

(a) The mode of the data set

(b) 5

Possible Answers:

It is impossible to tell from the information given.

(b) is greater.

(a) and (b) are equal.

(a) is greater.

Correct answer:

(a) and (b) are equal.

Explanation:

5 appears in the data set at least three times. Regardless of the value of , no other element (except 5) can appear more than twice. 5 must be the mode.

Example Question #4 : How To Find Mode

Consider the following set of data:

 

 

compare the mode and the median of the set.

Possible Answers:

The median is greater.

It is not possible to compare based on the information given.

The median and the mode are equal.

The mode is greater.

Correct answer:

The median and the mode are equal.

Explanation:

If there are an odd number of values in a data set, the median is the middle value. In this problem first we should put the numbers in order:

 

 

So the median is .

 

The mode of a set of data is the value which occurs most frequently, which is in this problem, which has occured three times in the given set of numbers. So the median and the mode are equal.

Example Question #5 : How To Find Mode

Compare the median and the mode in the following set of data:

 

Possible Answers:

The median is greater than the mode.

It is not possible to copare the median and the mode based on the information given.

The mode and the median are equal.

The mode is greater than the median.

Correct answer:

The mode is greater than the median.

Explanation:

If a data set has an even number of values, the median is the average of the two middle values. First we should put the numbers in order:

 

 

So the median is:

 

 

The mode of a set of data is the value which occurs most frequently, which is  in this problem. So the mode is greater than the median.

Example Question #6 : How To Find Mode

Compare the median and the mode in the following set of data:

 

Possible Answers:

The median is greater than the mode.

The median and the mode are equal.

It is not possible to compare the mode and the median based on the information given.

The mode is greater than the median.

Correct answer:

The median and the mode are equal.

Explanation:

If there are an odd number of values in a data set, the median is the middle value. In this problem first we should put the numbers in order:

 

 

So the median is .

 

The mode of a set of data is the value which occurs most frequently, which is . So the median and the mode are equal.

Example Question #7 : How To Find Mode

Compare the mean and the mode in the following set of data:

 

Possible Answers:

The mean and the mode are equal.

It is not possible to compare the mean and the mode based on the information given.

The mode is greater than the mean.

The mean is greater than the mode.

Correct answer:

The mean is greater than the mode.

Explanation:

The mode of a set of data is the value which occurs most frequently, which in this case is .

 

The mean of a set of data is given by the sum of the data, divided by the total number of values in the set. So we can write:

 

 

So the mean of is greater than the mode.

Example Question #8 : How To Find Mode

Compare the mean and the mode in the following set of data:

 

Possible Answers:

It is not possible to compare the mean and the mode based on the information given.

The mode is greater than the mean.

The mean is greater than the mode.

The mean and the mode are equal.

Correct answer:

The mean is greater than the mode.

Explanation:

The mode of a set of data is the value which occurs most frequently, which in this case is  .

 

The mean of a set of data is given by the sum of the data, divided by the total number of values in the set. So we can write:

 

 

So the mean is greater than the mode.

Example Question #141 : Data Analysis

Consider the following set of data where is an unknown value:

 

 

Which one is greater:

Possible Answers:

It is not possible to compare the mean and the mode based on the information given.

and are equal.

is greater

is greater

Correct answer:

and are equal.

Explanation:

The mode of a set of data is the value which occurs most frequently. The value of appears at least four times in the set. So regardless of the value of , none of the other values can appear more than two times. So is the mode.

Example Question #142 : Data Analysis

A data set has six known quantities and one unknown quantity, as follows:

Which is the greater quantity?

(A) The mode of the set if 

(b) The mode of the set if 

Possible Answers:

(A) is greater

It is impossible to determine which is greater from the information given

(A) and (B) are equal

(B) is greater

Correct answer:

(A) is greater

Explanation:

The mode of a data set is the element that occurs most frequently.

If , the set becomes .

The mode is 35, which occurs three times, more than any other element.

If , the set becomes .

The mode is 25, which occurs three times, more than any other element.

(A) is greater.

Example Question #143 : Data Analysis

Consider the data set .

Which of the following elements replaces the box to make the data set bimodal?

(A) 

(B) 

(C) 

Possible Answers:

(A) only

(B) only

None of (A), (B), or (C) are correct.

(A), (B), and (C) are all correct.

(C) only

Correct answer:

None of (A), (B), or (C) are correct.

Explanation:

At current, 40 appears four times, more than any other value. For a set to be bimodal, it needs to have two modes; that is, another value would have to appear four times as well. Regardless of whether 30, 50, 60, or any other value replaces the box, this is impossible. The set cannot be made bimodal by adding one element.

Example Question #144 : Data Analysis

Both 

 

and

are data sets with 2 as their only mode.

Which is the greater quantity?

(a) 

(b) 

Possible Answers:

It cannot be determined which of (a) and (b) is greater

(a) is the greater quantity

(a) and (b) are equal

(b) is the greater quantity

Correct answer:

It cannot be determined which of (a) and (b) is greater

Explanation:

The mode of a data set is the element that occurs the most frequently in the set.

In the data set ,  if , it appears four times, more than any other element. If , 1 and 2 each appear three times, making the set bimodal, so 2 is not the only mode, but one of two modes. If  is equal to any other number, 2 appears three times, again, more than any other element. Therefore,  can be any number except 1.

In the data set , each of 1, 2, and 3 appears twice. The only value of  that makes 2 appear the most times, and therefore, the only mode , is .

We therefore know that , but we do not know ; we do not know which one is the greater.

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