Question

1. the manager of a coffee shop recorded the number of customers who put vanilla creamer or chocolate creamer in their coffee during one hour and classified them by age. the results are shown in the table.

coffee creamer

age 18 - 30	age 31+
chocolate	6	8

what percentage of these customers put vanilla creamer in their coffee during this hour?
a. 30%
b. 40%
c. 60%
d. 70%

Explanation:

Step1: Calculate total number of customers with vanilla or chocolate creamer

Add the number of customers who used vanilla creamer (4 + 2) and those who used chocolate creamer (8+6).
$(4 + 2)+(8 + 6)=20$

Step2: Calculate number of customers who used vanilla creamer

$4+2 = 6$

Step3: Calculate the percentage

Use the formula $\text{Percentage}=\frac{\text{Number of vanilla - using customers}}{\text{Total number of creamer - using customers}}\times100\%$.
$\frac{6}{20}\times100\% = 30\%$

Answer:

A. 30%