Example 5.55 from Prealgebra, 5.5 Averages and Probability

Averages and Probability: example 5.55

The data lists the heights (in inches) of students in a statistics class. Identify the mode.

$56$	$61$	$63$	$64$	$65$	$66$	$67$	$67$
$60$	$62$	$63$	$64$	$65$	$66$	$67$	$70$
$60$	$63$	$63$	$64$	$66$	$66$	$67$	$74$
$61$	$63$	$64$	$65$	$66$	$67$	$67$

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Solution
List each number with its frequency.

Now look for the highest frequency. The highest frequency is $6,$ which corresponds to the height $67$ inches. So the mode of this set of heights is $67$ inches.

Your turn

The book's Try It right after this example: same idea, new numbers. Only the answer is given.

The ages of the students in a statistics class are listed here: $19$ , $20$ , $23$ , $23$ , $38$ , $21$ , $19$ , $21$ , $19$ , $21$ , $20$ , $43$ , $20$ , $23$ , $17$ , $21$ , $21$ , $20$ , $29$ , $18$ , $28$ . What is the mode?

How did it go?

Solution

Your turn

Solution

Your turn