Two types of dermabrasion treatment were subjected to customer's evaluation. Based on their experience, they are to give satisfaction rating on the dermabrasion treatment according to the...

Two types of dermabrasion treatment were subjected to customer's evaluation. Based on their experience, they are to give satisfaction rating on the dermabrasion treatment according to the effectiveness in treating acne. The tables below show the frequency distribution of scores varying from a low of 1 (very dissatisfied), 2 (dissatisfied), 3 (fairly dissatisfied), 4 (satisfied), to 5 (very satisfied). Dermabrasion Treatment Satisfaction score (X) Treatment A Freq. (f) Dermabrasion Treatment Satisfaction score (X) Treatment B ... Freq. (f) 5 6 1 10 17 15 3. 30 4 30 4 38 41 2.


What is the probability that the customers are very dissatisfied with treatment A? What is the probability that the customers are very dissatisfied with treatment B? What is the probability that the customers are at least satisfied with treatment A? What is the probability that the customers are at least satisfied with treatment B? Which is the better treatment in terms of consistency?

Extracted text: Two types of dermabrasion treatment were subjected to customer's evaluation. Based on their experience, they are to give satisfaction rating on the dermabrasion treatment according to the effectiveness in treating acne. The tables below show the frequency distribution of scores varying from a low of 1 (very dissatisfied), 2 (dissatisfied), 3 (fairly dissatisfied), 4 (satisfied), to 5 (very satisfied). Dermabrasion Treatment Satisfaction score (X) Treatment A Freq. (f) Dermabrasion Treatment Satisfaction score (X) Treatment B ... Freq. (f) 5 6 1 10 17 15 3. 30 4 30 4 38 41 2.