The article "Toward a Lifespan Metric of Reading Fluency" (S. Wallot and G. Van Orden, International Journal of Bifurcation and Chaos, 2011:1173-1192) described a study of reading speed for undergraduate and graduate students. In a sample of 24 undergraduates, the mean time to read a certain passage was 4.8 seconds, with a standard deviation of 1.9 seconds. Find a 95% confidence interval for the difference in reading speed between the two groups?

Identify whether the figure has plane symmetry, symmetry about an axis, or neither.

Two language majors, anna and megan, took exams in two languages. anna scored 85 on both exams. megan scored 74 on the first exam and 85 on the second exam. overall, student scores on the first exam had a mean of 82 and a standard deviation of 4, and the second exam scores had a mean of 71 and a standard deviation of 13. a) to qualify for language honors, a major must maintain at least an 85 average across all language courses taken. so far, which of anna and megan qualify? b) which student's overall performance was better?

How is working backward similar to solving an equation?