Measures of Central Tendency Flashcards

1
Q

What are the three measures of central tendency?

A
  • Mean
  • Median
  • Mode
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2
Q

What does the median tell us?

A

It splits the data in half. This means 50% of the data is below the median and 50% is above it.

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3
Q

What does the mode tell us?

A

It tells us the most common answer. It’s the number (or category) that is listed most often.

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4
Q

How do you find the median of a list of data?

A
  1. Count how many data there are. Add 1. Divide that by 2.
  2. Starting from the bottom, count up however much you just calculated in step 1.
    (If this is a decimal, the median is in between two numbers. You need to average these two numbers to find the median.)
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5
Q

How do you calculate mean from a frequency table?

A

GET MAD!!

  1. Multiply value and frequency.
  2. Add up all the new values and all the frequencies.
  3. Divide the totals.
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8
Q

How do you find the median from a frequency table?

A
  1. Find the cumulative frequency.
  2. Identify the closest bigger number to half of the frequency.
  3. Median is the value in the 1st column.
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9
Q

How do you find the mean of a list of data?

A

You add up all of the values and then divide by the number of values there are.

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10
Q

What is the math word we mean when we say “average” or “on average”?

A

MEAN

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11
Q

What is the fancy math communication sentence that we should use when talking about mean?

For example, the mean for number of texts per day sent by teenagers = 8.6.

A
  • On average, teens send 8.6 text messages per day.”
  • The average teen sends 8.6 text messages per day.”
  • The average number of text sent by teens per day is 8.6.”
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