Many people shop online primarily because they get access to product ratings submitted by fellow shoppers. The frequency table above gives the most recent 20 customer ratings for a certain product sold online. What is the mean rating for this product?

Options

A. `3.6`
B. `3.8`
C. `4`
D. `5`

Answer

A

Explanation

Difficult: Easy
Category: Problem Solving and Data Analysis/ Statistics and Probability.
Strategic Advice: To find the mean of a data set presented in a frequency table, multiply each data value (here, the rating) by the number of times it ( the frequency). Then, add the results and divide by the total number of data values.
Getting to the Answer:, The mean rating means the average score given. The sum of the rating is: `(1times1)+(2times3)+(3times5)+(4times5)+(5times6)=1+6+15+20+30=72`. Divide by the total number of rating(20) to find that the mean is `(72)/(20)=3.6`, which is (A).