A retail chain surveyed customers about how often they had used

Question

https://gmatclub.com/forum/download/file.php?id=89671 A retail chain surveyed customers about how often they had used self-checkout when shopping at its stores during the previous six months. Respondents selected exactly one of five options: never, rarely, sometimes, often, or always. The three charts show the distributions of responses for customers under age 30, customers ages 30 to 49, and customers age 50 or older. Select from the drop-down menus the options that complete the statement most accurately based on the information provided. Exactly 80 percent of GRAPH_1_PLACEHOLDER customers reported using self-checkout at least GRAPH_2_PLACEHOLDER . GMAT-Club-Forum-i0rwmnho.png

Bunuel · Accepted Answer

https://gmatclub.com/forum/download/file.php?id=89671

A retail chain surveyed customers about how often they had used self-checkout when shopping at its stores during the previous six months. Respondents selected exactly one of five options: never, rarely, sometimes, often, or always. The three charts show the distributions of responses for customers under age 30, customers ages 30 to 49, and customers age 50 or older.

Select from the drop-down menus the options that complete the statement most accurately based on the information provided.

Exactly 80 percent of customers reported using self-checkout at least .

Select from the drop-down menus the options that complete the statement most accurately based on the information provided.

Exactly 80 percent of  GRAPH_1_PLACEHOLDER  customers reported using self-checkout at least  GRAPH_2_PLACEHOLDER .

Official Solution:

We need to find an age group for which exactly  80%  of customers fall at or above one of the given frequency levels. Equivalently, 20% must fall below that level.

For customers ages 30 to 49:

Never + Rarely = 7% + 13% = 20%

Therefore, the remaining:

100% - 20% = 80%

reported using self-checkout sometimes, often, or always, which means they used self-checkout  at least sometimes .

Therefore, exactly 80 percent of  customers ages 30 to 49  reported using self-checkout  at least sometimes .

Correct answer: 
Drop-down 1: "customers ages 30 to 49"
Drop-down 2: "sometimes"

dhart · Answer

1. customer ages 30-49,
2. sometimes

TheAdmissionHub · Answer

First of all, we should start with the percentage of customers who reported " never " using self-checkout. Since we are looking for  exactly 80%  of customers who use self-checkout at least a certain frequency, we need to add the percentages starting from “never” until we reach  20% .
The remaining 80% will then represent the customers who use self-checkout at least that frequency.

Under 30) "Never" is 4%, "Rarely" is 8%, "Sometimes" is 18% ⭢ we cannot obtain exactly 20%.

30-49) "Never" is 7%, "Rarely" is 13% ⭢ the sum is 20%, which means that  exactly 80% of c   ustomers uses self-checkout at least sometimes .

50 or older) "Never" is 15%, "Rarely" is 20% ⭢ we cannot obtain exactly 20%.

Answer: " customers ages 30-49 ", " sometimes "

officiisnobis · Answer

Ages 30-49
Sometimes

TreePlum · Answer

how do you determine the answer is sometimes? why not rarely, since 7% (never) + 13% (sometimes) = 20% ?

Bunuel · Answer

Please check the official solution above. Hope it helps.

A retail chain surveyed customers about how often they had used

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