Question

3 from unit 1, lesson 2 the dot plot displays the lengths of pencils (in inches) used by students in a class. length (inches) what is the mean? from unit 1, lesson 2 the histogram represents ages of 39 people at a store that sells children’s clothes

Explanation:

Step1: Count the number of data - points

There is 1 dot at 5, 2 dots at 5.5, 4 dots at 6, 2 dots at 6.5, and 1 dot at 7. So the total number of data - points $n=1 + 2+4 + 2+1=10$.

Step2: Calculate the sum of all data - points

The sum $S=(5\times1)+(5.5\times2)+(6\times4)+(6.5\times2)+(7\times1)=5 + 11+24 + 13+7=60$.

Step3: Calculate the mean

The mean $\bar{x}=\frac{S}{n}=\frac{60}{10}=6$.

Answer:

6