Question

4 from unit 1, lesson 3 the dot plot represents the distribution of satisfaction ratings for a landscaping company on a scale of 1 to 10. twenty - five customers were surveyed. on average, what was the satisfaction rating of the landscaping company?

Explanation:

Step1: Count number of dots per rating

1 dot for rating 1, 0 dots for rating 2 - 4, 6 dots for rating 5, 0 dots for rating 6 - 7, 10 dots for rating 8, 3 dots for rating 9, 5 dots for rating 10.

Step2: Calculate sum of products

$(1\times1)+(5\times6)+(8\times10)+(9\times3)+(10\times5)=1 + 30+80 + 27+50 = 188$.

Step3: Calculate average

The average $\bar{x}=\frac{188}{25}=7.52$.

Answer:

$7.52$