Question

1. a person delivers packages in a downtown business several times each day. the table shows delivery times in minutes throughout the week. what is the sample mean delivery time?

day	time of day	delivery time (minutes)
monday	afternoon	22
tuesday	morning	19
tuesday	afternoon	23
wednesday	morning	20
wednesday	afternoon	24
thursday	morning	21
thursday	afternoon	25
friday	morning	20
friday	afternoon	22

a. 21.1
b. 21.4
c. 21.0
d. 21.6

Explanation:

Step1: List all delivery - times

18, 22, 19, 23, 20, 24, 21, 25, 20, 22

Step2: Calculate the sum of delivery - times

$18 + 22+19 + 23+20 + 24+21 + 25+20 + 22=214$

Step3: Determine the number of data - points

There are 10 delivery - time data - points.

Step4: Calculate the sample mean

The sample mean $\bar{x}=\frac{214}{10}=21.4$

Answer:

b. 21.4