Math Problem Statement

how do you find the median?

How do you find the median?

Solution

To find the median for the given data in the table, follow these steps:

Step-by-Step Process:

  1. Understand the Median:

    • The median is the middle value of the data when arranged in ascending order.
    • If the total frequency (nn) is odd, the median is the n+12\frac{n+1}{2}-th value.
    • If nn is even, the median is the average of the n2\frac{n}{2}-th and (n2+1)(\frac{n}{2} + 1)-th values.
  2. Identify the Total Frequency (nn):

    • From the table, add up the frequencies: n=10+6+11+13+14+6=60n = 10 + 6 + 11 + 13 + 14 + 6 = 60
  3. Find the Median Position:

    • Since n=60n = 60 (even), the median will be the average of the 30th and 31st values.
  4. Determine the Cumulative Frequency: Create a cumulative frequency column to locate the 30th and 31st values:

    • For Score=1\text{Score} = 1: Cumulative Frequency=10\text{Cumulative Frequency} = 10
    • For Score=2\text{Score} = 2: Cumulative Frequency=10+6=16\text{Cumulative Frequency} = 10 + 6 = 16
    • For Score=3\text{Score} = 3: Cumulative Frequency=16+11=27\text{Cumulative Frequency} = 16 + 11 = 27
    • For Score=4\text{Score} = 4: Cumulative Frequency=27+13=40\text{Cumulative Frequency} = 27 + 13 = 40
    • For Score=5\text{Score} = 5: Cumulative Frequency=40+14=54\text{Cumulative Frequency} = 40 + 14 = 54
    • For Score=6\text{Score} = 6: Cumulative Frequency=54+6=60\text{Cumulative Frequency} = 54 + 6 = 60
  5. Locate the Median Scores:

    • The 30th and 31st values fall within the cumulative frequency range of 27<30,314027 < 30, 31 \leq 40, which corresponds to a score of 4.
  6. Calculate the Median:

    • Since both the 30th and 31st values have the same score of 4, the median is: Median=4\text{Median} = 4

Final Answer:

The median score is 4.


If you have more questions or need clarification, let me know! Here are related questions you might find helpful:

  1. How do you calculate the mean for grouped data like this?
  2. How can you visualize the cumulative frequency with a graph?
  3. What happens if the total frequency is odd?
  4. How do you interpret mode, mean, and median in such a dataset?
  5. How can you find the range of the scores from the data?

Tip: Always organize cumulative frequency carefully to avoid errors when locating the median.

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Math Problem Analysis

Mathematical Concepts

Statistics
Median
Cumulative Frequency

Formulas

Median position for even n: (n/2)-th and (n/2 + 1)-th values
Cumulative frequency: Sum of all frequencies up to the current score

Theorems

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Suitable Grade Level

Grades 7-10