Statistics

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GRE Quantitative Reasoning › Statistics

Questions 1 - 10

1

What is the mean of:

$6.\overline {33}$

Explanation

Step 1: Find the sum of the numbers

Step 2: Count how numbers there are:

There are numbers..

Step 3: Divide Sum by how many numbers

$Mean=\frac {38}{6}=6.\overline {33}$

2

What is the mean of

Explanation

Step 1: Find the sum of the numbers

Step 2: Find how many numbers

There are numbers..

Step 3: Divide the sum by how many numbers they are...This division gives us the mean..

$Mean=\frac {20}{5}=4$

3

What is the mean of:

Explanation

Step 1: Take the sum of all numbers in the set...

Step 2: Count how many elements are in the set...

There are numbers

Step 3: To find the mean, divide the sum by the number of elements..

$\frac {57}{10}=5.7$

The mean is

4

What is the mean of

Explanation

Step 1: Find the sum of the numbers

Step 2: Find how many numbers

There are numbers..

Step 3: Divide the sum by how many numbers they are...This division gives us the mean..

$Mean=\frac {20}{5}=4$

5

What is the range of the set of numbers: ?

Explanation

Step 1: Arrange the numbers in the set from smallest to largest:

After we arrange, we get: .

Step 2: To find the range, subtract the largest number from the smallest number.

The range of the data set is .

6

What is the mean of $\large {2,4,5,7,11,19,23,1,1,1}$

$\large 7.4$

$\large 7$

$\large 7.5$

$\large 7. \overline {4}$

Explanation

Step 1: Find the sum of the numbers in the set... $\large 2+4+5+7+11+19+23+1+1+1=74$

Step 2: Count how many numbers are in the set..

There are 10 numbers...

Step 3: Divide the total sum by how many numbers...

So, $\large \frac {74}{10}=7.4$

7

What is the mean of:

$6.\overline {33}$

Explanation

Step 1: Find the sum of the numbers

Step 2: Count how numbers there are:

There are numbers..

Step 3: Divide Sum by how many numbers

$Mean=\frac {38}{6}=6.\overline {33}$

8

What is the range of the set of numbers: ?

Explanation

Step 1: Arrange the numbers in the set from smallest to largest:

After we arrange, we get: .

Step 2: To find the range, subtract the largest number from the smallest number.

The range of the data set is .

9

What is the mean of $\large {2,4,5,7,11,19,23,1,1,1}$

$\large 7.4$

$\large 7$

$\large 7.5$

$\large 7. \overline {4}$

Explanation

Step 1: Find the sum of the numbers in the set... $\large 2+4+5+7+11+19+23+1+1+1=74$

Step 2: Count how many numbers are in the set..

There are 10 numbers...

Step 3: Divide the total sum by how many numbers...

So, $\large \frac {74}{10}=7.4$

10

What is the mean of:

Explanation

Step 1: Take the sum of all numbers in the set...

Step 2: Count how many elements are in the set...

There are numbers

Step 3: To find the mean, divide the sum by the number of elements..

$\frac {57}{10}=5.7$

The mean is

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