Finite Math Examples Frequency Distribution

Find the Median Class Interval of the Frequency Table

$\begin{array}{c} Class & Frequency \\ 15 - 21 & 7 \\ 22 - 28 & 3 \\ 29 - 35 & 2 \\ 36 - 42 & 5 \\ 43 - 49 & 1 \end{array}$

Step 1

Add up all of the frequencies.

$7 + 3 + 2 + 5 + 1 = 18$

Step 2

Find the median of the integers from $1$ to $18$ .

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Step 2.1

Arrange the terms in ascending order.

$1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18$

Step 2.2

The median is the middle term in the arranged data set. In the case of an even number of terms, the median is the average of the two middle terms.

$\frac{9 + 10}{2}$

Step 2.3

Remove parentheses.

$\frac{9 + 10}{2}$

Step 2.4

Add $9$ and $10$ .

$\frac{19}{2}$

Step 2.5

Convert the median $\frac{19}{2}$ to decimal.

$9.5$

Step 3

Starting with $0$ , add the frequencies in the table starting with the first row until you reach $9.5$ . The median class interval is the corresponding class where the median value falls.

Median Class: $22 - 28$

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Find the Median Class Interval of the Frequency Table

Frequency Distribution

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