Question: Helen is doing a study where she is looking at the percentage of students proficient in mathematics over a 10-year period in a school district.

Helen is doing a study where she is looking at the percentage of students proficient in mathematics over a 10-year period in a school district. What would be the best way to display the trend in percentages?

a) a scatterplot

b) a bar graph

c) a line graph

d) calculate the mean and standard deviation

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