Question

Your company produces a new face mask which is sold online. The face mask is rated on a five point scale (1= very bad, 5=very good) on your website. The ratings are presented below. Find the expected value (mean), variance, standard deviation for the ratings of your widget. What percent of individuals rated your product as 2 or below?

Ratings	Odds
1	10%
2	10%
3	10%
4	30%
5	40%

Answer 1

Let X be a random variable denoting the ratings.

The percent of individuals rated your product as 2 or below

= Percent of individuals rated your product as 1 + Percent of individuals rated your product as 2

= 10% + 10%

= 20%