# Thread: Random Variable of Interest ?

1. ## Random Variable of Interest ?

Got another problem:

The David Myer department store is open for business 10 hours per day. Last Monday, the store’s receptionist noted the number of incoming telephone enquiries about David Myer credit cards for each of the 10 hours of trading.
(a)What is the random variable of interest?

and for this one i know its the 'mean' so they couldn be mode and median am i correct ?

The receptionist reported to management that the ‘average’ number of telephone enquiries per hour for the day was 7.5.
(b) Explain whether the value 7.5 could be

(i) the mode of the day’s data.
(ii) the median of the day’s data.
(iii) the mean of the day’s data.

cheers.

2. Originally Posted by omrkwlh
Got another problem:

The David Myer department store is open for business 10 hours per day. Last Monday, the store’s receptionist noted the number of incoming telephone enquiries about David Myer credit cards for each of the 10 hours of trading.
(a)What is the random variable of interest?
Number of calls in an hour

and for this one i know its the 'mean' so they couldn be mode and median am i correct ?

The receptionist reported to management that the ‘average’ number of telephone enquiries per hour for the day was 7.5.
(b) Explain whether the value 7.5 could be

(i) the mode of the day’s data.
(ii) the median of the day’s data.
(iii) the mean of the day’s data.

cheers.
Can be any of these. Average is a vague non-mathematical term to describe
the central tendency of a data set. Typically this can be any of the mode,
median or arithmetic mean.

Though arithmetic mean is more common than the mode or median.

RonL