A customer service survey was conducted of 500 customers: 250 men and 250 women. The data on one of the questions show that 175
men and 160 women rate the customer service as excellent. What percentage of men gave an excellent rating? What percentage of women gave an excellent rating? What was the total percentage of customers giving an excellent rating?
Given that men and women were selected, either had the option of giving the customer service an excellent rating or not. As such , where there were 250 men and 175 men gave an excellent rating, this represents
= 175/250 × 100%
=70%
It means 70% of the men gave an excellent rating.
Likewise, where there were 250 women and 160 women rate the customer service as excellent. This represents
= 160/250 × 100%
=64%
It means 64% of the women gave an excellent rating.
Your answers may vary slightly. 5.2 Normal Distributions: Finding Probabilities If you are given that a random variable Xhas a normal distribution, nding probabilities corresponds to nding the area between the standard normal curve and the x-axis, using the table of z-scores. The mean (expected value) and standard deviation ˙should be given
