How to find mean - ISEE Middle Level Quantitative Reasoning

Card 0 of 825

Question

Find the mean in this set of numbers:

5570, 4886, 5226, 4120, 6561, 4120, 6008

Answer

First, add all the numbers in this set:

Then, divide that amount by the total number in the set:

$36491\div 7=5213$

Answer: The mean is 5213.

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Question

Find the mean in this set of numbers:

9078, 9008, 9800, 9099, 9009, 9090, 9008

Answer

First add all the numbers:

Then, divide that number by 7:

$64,092\div 7=9156$

Answer: The mean is 9156

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Question

Find the average of these amounts:

\$34.78, \$21. 69, \$76.89, \$47.88

Answer

First, add all the amounts:

Then, divide by 4:

$181.24\div 4=45.31$

Answer: The average is 45.31

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Question

Find the mean of the following set of numbers: 227, 215, 206, 238, 249

Answer

Add the numbers, and divide by 5:

$\frac{ 227 + 215 +206+238+ 249}{5} = \frac{1,135}{5} = 227$

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Question

Find the mean in this set of numbers:

210, 120, 110, 220, 120

Answer

First, add up all of the numbers in the set:

Then, divide: $780 \div 5=156$

Answer: The mean is 156.

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Question

Patricia is shopping for a coat. She is considering three coats. Each costs \$85.98, \$93.29 and \$88.99, respectively. What is the average price of a coat she is considering?

Answer

First, add up all of the prices:

Then, divide $268.26 \div 3= 89.42$ .

Answer: The average price of a coat is \$89.42.

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Question

In a group of 4 books, the average number of pages is is 10. Juan adds a book with 20 pages to the group. What is the new average number of pages?

Answer

If the average of 4 books was 10, then the total number of pages was $4\times10 =40$ . Adding in the 20 new pages, but now dividing by 5 you get .

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Question

Give the mean of the data set (nearest tenth, if applicable):

$\left { 56,78,98,85,77,73 \right }$

Answer

Add the six elements and divide the sum by 6:

$467 \div 6 \approx 77.8$

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Question

Give the mean of the following data set:

$\left {1, 2, 3, 3, 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 9, 10 \right }$

Answer

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

$(1+ 2+ 3+ 3+ 4+ 4+ 4+ 5+ 5+ 6+ 6+ 6+ 6+ 7+ 9+ 10) \div 16 = 81 \div 16 = 5.0625$

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Question

Find the mean of this set of numbers:

54, 41, 99, 120, 66.

Answer

Firrst, add the numbers:

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

$380\div 5=76$

Answer: The mean is 76.

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Question

Find the average of this set of numbers:

521, 834, 754, 902, 899

Answer

First, add all the numbers in this set:

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

$3910\div 5=782$

Answer: The average is 782.

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Question

Adrienne is trying on dresses for prom. The dresses she likes each cost $\$129$ , $\$134$ , $\$127$ and $\$132$ , respectively. What is the average dress price that Adrienne is considering?

Answer

First, add up all of the dress prices:

Then, divide by the number of dresses:

$522 \div 4=130.50$

Answer: The average dress price is $\$130.50$

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Question

Find the average of this set of numbers:

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

Answer

First, add all the numbers in this set:

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

$17703\div 7=2529$

Answer: The average is

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Question

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?

Answer

First, add all of the prices:

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

$10.11\div 3=3.37$

Answer: The average price of a gallon of milk is $\$3.37.$

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Question

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?

Answer

First, add all of the prices:

Then, divide by 3 (total number of stations)

$10.88\div 3=3.62$

Answer: The average price for a gallon of gas in my town is $\$3.62.$

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Question

Find the mean in this set of numbers:

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

Answer

First, add all the numbers in this set:

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

$26565 \div 7=3795$

Answer: The mean is 3795

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Question

While shopping for a couch, Mila found four she really liked. Each cost $\$549$ , $\$689$ , $\$481$ and $\$729$ . What is the average price of a couch Mila is considering?

Answer

First, add all the prices:

Then, divide by 4 (the number of couches):

$2448 \div 4=612$

Answer: The average price of a couch Mila is considering is \$612.

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Question

Elizabeth went food shopping today. She spent \$32.78, \$21.63 and \$19.39 at each supermarket. How much did Elizabeth spend, on average, at each supermarket?

Answer

First, add the amounts Elizabeth spent at each supermarket:

Then divide by 3 (the number of supermarkets she went to):

$73.80 \div 3=24.60$

Answer: On average, Elizabeth spent \$24.60 at each supermarket.

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Question

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?

Answer

First, add the lengths of the races:

Then divide by the number of races:

$4800 \div 3=1600$

Answer: The average race was 1600 meters.

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Question

Find the mean for this set of numbers:

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

Answer

First, add all the numbers in the set:

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

$45066\div 7=6438$

Answer: The mean is 6438

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