(a) With suitable examples, discuss the importance of scale of measurements in statistics.

(b) The advertising expenditure per month, in dollars, at a tourism company are given below.

1600

1800

2500

1500

3200

4500

6000

3200

1200

5000

(i) Calculate the mean, median, first quartile and third quartile.

(ii) Calculate the variance and standard deviation, interquartile range and coefficient of variation.

(iii) What conclusion can you reach about advertising expenditure at this store.