Algebra 1 : How to find mean

Study concepts, example questions & explanations for Algebra 1

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Example Questions

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Example Question #1 : Statistics And Probability

What is the mean of 44, 22, 134, and 200?

Possible Answers:

66

88

144

100

Correct answer:

100

Explanation:

To find the mean, you must add all of the numbers together and divide by the amount of numbers. In this case there are four numbers so, we must deivide the total sum by 4.

Example Question #7 : Basic Statistics

Calculate the mean of the following numbers: 11, 13, 16, 13, 14, 19, 13, 13

Possible Answers:

Correct answer:

Explanation:

First, calculate the sum of all of the numbers.

Next, divide by the total number.

Example Question #1 : Statistics And Probability

Find the mean of this number set: 2, 5, 6, 7, 7, 3

Possible Answers:

Correct answer:

Explanation:

The numbers add up to 30. To find the mean, divide by the number of numbers (6) and you get a mean of 5. Mean is a fancy way of saying average.

Example Question #8 : Basic Statistics

The class average in a class of 15 is 86%. If one additional student earns a 100% in the class, what is the new class average.

Possible Answers:

There is not enough information to answer this question

None of the available answers

Correct answer:

Explanation:

We can treat this as if the entire class had exactly 86% as their average, so the new average is:

Example Question #1 : How To Find Mean

What is the mean of the following numbers?

88,99,31,47,68,27

Possible Answers:

Correct answer:

Explanation:

To find the mean you add all of the numbers together and divide it by the amount of numbers. In this case there are six numbers so 

The answer is .

Example Question #2 : How To Find Mean

Possible Answers:

Correct answer:

Explanation:

Example Question #3 : How To Find Mean

Possible Answers:

Correct answer:

Explanation:

 

Example Question #4 : How To Find Mean

Sally's algebra grade depends on three tests and a final. The final is worth two regular tests. What grade must she get on her final to get an A for the course if her test scores so far are ?

To get an A, her average score must be greater than or equal to .

Possible Answers:

Correct answer:

Explanation:

The course grade average is given by three tests and a final, where a minimum average of is needed for an A.

Let = the final score, and set the equation equal to , since this is our minimum value.

Example Question #6 : Statistics And Probability

The sum of the elements of a data set is ; the mean of the elements is . How many elements are there in the set?

Possible Answers:

It is impossible to tell from the imformation given.

Correct answer:

Explanation:

The mean, , of a data set is the sum of the elements, , divided by the number of elements, .

We know that and . Now we can solve for .

Example Question #9 : Statistics And Probability

Two standard dice are rollled. What is the probability that the sum of both dice is greater than ?

Possible Answers:

Correct answer:

Explanation:

There are  total possible outcomes ( sides on one die times  sides on the other). The following are the possible outcomes that are greater than .

 and

 and

5 and

 and

 and

 and

There are possible outcomes greater than , out of  possible outcomes total; thus, there is a chance of rolling greater than .

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