Question

the following bar chart displays the relative frequency of responses of students, by grade level when asked, \do you volunteer in a community - service activity?\ which of the following statements is not supported by the bar chart? a more than 60% of both tenth - grade and eleventh - grade students responded yes. b twelfth - grade students had the least percentage of students respond yes. c less than 40% of tenth - grade students responded no. d the number of tenth - grade students who responded yes was greater than the number of ninth - grade students who responded yes. e the percentage of eleventh - grade students who responded no was less than the percentage of ninth - grade students who responded no.

Explanation:

Step1: Analyze option A

For tenth - and eleventh - grade, the 'Yes' part of the bar is above 0.6. So this statement is supported.

Step2: Analyze option B

The 'Yes' part of the twelfth - grade bar is the shortest among all grades. So this statement is supported.

Step3: Analyze option C

For tenth - grade, the 'No' part of the bar is below 0.4. So this statement is supported.

Step4: Analyze option D

The bar chart shows relative frequencies, not the actual number of students. We cannot compare the actual number of students who responded yes in tenth - grade and ninth - grade from relative frequencies alone. This statement is not supported.

Step5: Analyze option E

The 'No' part of the eleventh - grade bar is shorter than the 'No' part of the ninth - grade bar. So this statement is supported.

Answer:

D. The number of tenth - grade students who responded yes was greater than the number of ninth - grade students who responded yes.