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Get Ready: Describe the Data Using the Median

The median is the middle value of a data set when the numbers are in order. Half the data is at or below it, and half is at or above it. To get ready, order numbers least to greatest, find the middle of a list, and find the number halfway between two numbers (add them, then divide by 2). La mediana es el valor del medio de un conjunto de datos cuando los números están en orden. La mitad de los datos está en ella o debajo, y la otra mitad está en ella o arriba. Para prepararte, ordena números de menor a mayor, halla el medio de una lista y halla el número que está a la mitad entre dos números (súmalos y luego divide entre 2).

Readiness Pre-Lesson Unit 2 · Lesson 3 Builds toward 6.DS.4
Readiness progress: 0%
Why this matters for Lesson 2-3: The median is the middle value of a data set when the numbers are in order. Half the data is at or below it, and half is at or above it. To get ready, order numbers least to greatest, find the middle of a list, and find the number halfway between two numbers (add them, then divide by 2). La mediana es el valor del medio de un conjunto de datos cuando los números están en orden. La mitad de los datos está en ella o debajo, y la otra mitad está en ella o arriba. Para prepararte, ordena números de menor a mayor, halla el medio de una lista y halla el número que está a la mitad entre dos números (súmalos y luego divide entre 2).
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Quick Check · 1 minute

Where should you start?

Answer these 3, then press Show my path. No grade — this just points you to the right level.

1. What is 2 + 4 + 6?

2. What is 12 ÷ 3?

3. Put in order least to greatest: 5, 2, 8. Which is the middle number?

🧱 Start at Level 0. We'll build this from the ground up with small steps. That's totally fine — take your time below.
🛠️ Start at Level 1. You've got the idea — a little guided practice and you'll be ready.
🚀 Start at Level 2. Your basics are strong! Do the quick warm-up and head into the lesson.
⚠️ Answer all 3 questions first, then press Show my path.
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Learn It

Order first, then find the middle Primero ordena, luego halla el medio

Median = order the numbers, then take the middle. With an odd count, one number is in the middle. With an even count, two numbers share the middle, so find the number halfway between them: add the two, then divide by 2.

Mediana = ordena los números y luego toma el del medio. Con una cantidad impar, hay un número en el medio. Con una cantidad par, dos números comparten el medio, así que halla el número que está a la mitad entre ellos: súmalos y luego divide entre 2.

Median of 6, 2, 8, 4: order them → 2, 4, 6, 8. The two middle numbers are 4 and 6. (4 + 6) ÷ 2 = 5. Mediana de 6, 2, 8, 4: ordénalos → 2, 4, 6, 8. Los dos números del medio son 4 y 6. (4 + 6) ÷ 2 = 5.
Median of 7, 3, 5: order them → 3, 5, 7. The middle is 5. Always order first! Mediana de 7, 3, 5: ordénalos → 3, 5, 7. El del medio es 5. ¡Siempre ordena primero!
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Practice · Your Level

Try It

Your quick check picks one for you, but you can switch any time:

Level 0 One small step at a time.

A. Add the list: 3 + 3 + 3 = ___

Hint

3 + 3 = 6, then 6 + 3 = 9.

B. Put 9, 3, 6 in order from least to greatest. Which number comes first? B. Pon 9, 3, 6 en orden de menor a mayor. ¿Qué número va primero?

Hint · Pista

Ordered: 3, 6, 9. The least number, 3, comes first. En orden: 3, 6, 9. El número menor, 3, va primero.

C. Order least to greatest: 4, 1, 2. The middle number is ___

Hint

Ordered: 1, 2, 4. The middle one is 2.

Level 1 Find totals, then the middle of a list. Halla totales y luego el medio de una lista.

A. Add: 2 + 5 + 5 = ___

Hint

2 + 5 = 7, then 7 + 5 = 12.

B. Order least to greatest: 8, 1, 5, 3, 7. The middle number is ___ B. Ordena de menor a mayor: 8, 1, 5, 3, 7. El número del medio es ___

Hint · Pista

Ordered: 1, 3, 5, 7, 8. The middle of 5 numbers is the 3rd → 5. En orden: 1, 3, 5, 7, 8. El del medio de 5 números es el 3.º → 5.

C. In the list 6, 2, 6, 9, which value is the mode (most common)?

Hint

6 appears twice; every other number appears once.

Level 2 Find a median start to finish, with an odd or even count. Halla una mediana de principio a fin, con una cantidad impar o par.

A. Find the median of 10, 2, 6, 4. There are 4 numbers, so find the number halfway between the two middle numbers. A. Halla la mediana de 10, 2, 6, 4. Hay 4 números, así que halla el número que está a la mitad entre los dos números del medio.

Hint · Pista

Ordered: 2, 4, 6, 10. The two middle numbers are 4 and 6. (4 + 6) ÷ 2 = 5. En orden: 2, 4, 6, 10. Los dos números del medio son 4 y 6. (4 + 6) ÷ 2 = 5.

B. Find the median of 9, 4, 7, 2, 5 (order first, take the middle).

Hint

Ordered: 2, 4, 5, 7, 9. The middle of 5 numbers is the 3rd → 5.

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Exit Ticket

Show You're Ready

1. The list 3, 7, 9, 12 is in order. What number is halfway between the two middle numbers? 1. La lista 3, 7, 9, 12 está en orden. ¿Qué número está a la mitad entre los dos números del medio?

Hint · Pista

The two middle numbers are 7 and 9. (7 + 9) ÷ 2 = 8. Los dos números del medio son 7 y 9. (7 + 9) ÷ 2 = 8.

2. What is the median of 8, 2, 6? (Order first, take the middle.)

Hint

Ordered: 2, 6, 8. Middle = 6.

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Neft Teacher · Readiness Pre-Lesson · Lesson 2-3 ·