# Chapter 11 Data Analysis and Statistics - 11.1 Find Measures of Central Tendency and Dispersion - 11.1 Exercises - Skill Practice - Page 747: 5

See below.

#### Work Step by Step

The mean of $n$ numbers is the sum of the numbers divided by $n$. The median of $n$ is the middle number of the numbers when they are in order (and the mean of the middle $2$ numbers if $n$ is even). The mode of $n$ numbers is the number or numbers that appear(s) most frequently. Hence here the mean: $\frac{69+70+71+73+73+74+75+78+78+84}{10}=74.5$. The median is the average of the middle two numbers in the sequence, $69, 70, 71, 73, 73,74, 75, 78,78, 84$, which is: $(73+74)/2=73.5$. The mode is $73,78$.

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