Refer to the age histogram in part a of Exercise 77 and complete the sentences below with the proper number. You don’t need to make any detailed calculations. 

Choose the most “reasonable” answer. 

a. The mean age of recent customers is approximately 

i) 18 

ii) 23 

iii) 26 

iv) 31 

b. The median age of recent customers is approximately 

i) 20 

ii) 22 

iii) 27 

iv) 32 

c. The standard deviation of the age distribution is approximately 

i) 3 

ii) 6 

iii) 12 

iv) 18