a simple random sample of 30 residents from seattle is taken to estimate the median income of all seattle residents.
is this study
a. representative?
b. non-representative?

A) Representative

Explanation: A representative study is the study which is regarding the a cluster of people that has near about features that is similar to the most of the people of population. The characteristic in the cluster of people are considered as common which display the accurate sample features for the study.

The case mentioned in the question is a representative study case because it includes the residents of the country which tend to has closely matching features of the whole population of the country.

answer: do you still need this?

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.