The frequency bar chart shows last month’s delivery times for packages shipped through National Express by customers who used National’s three-day delivery time option.

a. In one or two sentences, summarize the information that the chart is providing.

b. Show the approximate location of the mean, median and mode for the delivery time distribution. (Don’t make any detailed calculations. Just give an “educated” estimate.) 

c. The MAD for the distribution looks to be approximately

i) 1.5

ii) 5.5

iii) 8.5

iv) 15

d. The standard deviation for the distribution looks to be approximately 

i) 1

ii) 2

iii) 8

iv) 12

Delivery Times Time (days)