Question

a group of high school students worked part - time jobs over the summer. their weekly earnings are shown in the dot plot. what is the mean of their earnings? weekly wages $130 $100 $150 $180

Explanation:

Step1: Count number of data - points

There are 1 + 2+ 3+ 2+ 1 = 9 data - points.

Step2: Calculate sum of earnings

1×130 + 2×140+3×150 + 2×160+1×170 = 130+280 + 450+320+170 = 1350.

Step3: Calculate the mean

Mean = $\frac{1350}{9}=150$.

Answer:

$150$