ISEE Middle Level Math : How to find mean

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

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Example Question #1 : How To Find Mean

On the first four exams, Charley scored 92, 88, 76, and 74. Charley wants to have a test average of 85%.  What must Charley score on the fifth exam to average 85%?

Possible Answers:

85%

95%

82%

100%

90%

Correct answer:

95%

Explanation:

The summation of the first four exams equals 330.  Using the equation for average, Charley needs to get a 95 on the last exam.

 

 

Example Question #2 : How To Find Mean

Give the mean of the following data set:

Possible Answers:

Correct answer:

Explanation:

Since there are 16 elements, divide their sum by 16 to get the mean:

Example Question #1 : How To Find Mean

Find the average of this set of numbers:

521, 834, 754, 902, 899

Possible Answers:

Correct answer:

Explanation:

First, add all the numbers in this set:

Divide, 3910 by the total amount of numbers in the set:

Answer: The average is 782.

Example Question #1 : How To Find Mean

Adrienne is trying on dresses for prom. The dresses she likes each cost , ,  and , respectively. What is the average dress price that Adrienne is considering?

Possible Answers:

Correct answer:

Explanation:

First, add up all of the dress prices:

Then, divide by the number of dresses:

Answer: The average dress price is 

Example Question #3 : How To Find Mean

Find the average of this set of numbers:

2521, 2512, 2525, 2552, 2551, 2525, 2517

Possible Answers:

Correct answer:

Explanation:

First, add all the numbers in this set:

Then, divide by the amount of numbers in the set:

Answer: The average is

 

 

Example Question #2 : How To Find Mean

In my town, a gallon of milk costs $3.21, $3.39 and $3.51 in three different stores. What is the average price of a gallon of milk in my town?

Possible Answers:

Correct answer:

Explanation:

First, add all of the prices:

Then divide, that amount by 3 (number of stores in town):

Answer: The average price of a gallon of milk is

Example Question #5 : How To Find Mean

In my town, a gallon of gas costs $3.47, $3.79 and $3.60 in three different stations. What is the average price of a gallon of gas in my town?

Possible Answers:

Correct answer:

Explanation:

First, add all of the prices:

Then, divide by 3 (total number of stations)

Answer: The average price for a gallon of gas in my town is

Example Question #3 : How To Find Mean

Find the mean in this set of numbers:

3343, 4434, 4334, 3343, 4343, 3434, 3334

Possible Answers:

Correct answer:

Explanation:

First, add all the numbers in this set:

Then, divide by 7 (the amount of numbers in this set):

Answer: The mean is 3795

Example Question #4 : How To Find Mean

Find the mean for this set of numbers:

6366, 6336, 6366, 6633, 6333, 6363, 6669

Possible Answers:

Correct answer:

Explanation:

First, add all the numbers in the set:

Then, divide by the total amount of numbers in the set:

Answer: The mean is 6438

Example Question #5 : How To Find Mean

Felicia ran three races as a member of the track team. The races were 1000 meters, 2000 meters and 1800 meters, respectively. What was the average distance of the 3 races?

Possible Answers:

Correct answer:

Explanation:

First, add the lengths of the races:

Then divide by the number of races:

Answer: The average race was 1600 meters.

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