The stem-and-leaf plot below shows the number of pages each student in the class read the previous evening.
according to the plot, 75% of students read less than
a.13 pages.
b.33 pages.
c.35 pages.
d.46 pages.

Stem and leaf plots are a way of organizing data; the stem shows the first digit and then the leaves show the second digit. We have that the number of observations (which is equal to the number of leaves) is 23. 23*75%=17.75. Let us see what the 18th student studied for; 35 hours is the result. Since the data in a stem leaf plot is in ascending order, we just need to notice the 18th leaf, reading from left to right. Hence, 75% of students read less than 35 pages. 33 pages would be wrong since only 17/23=74% of students read less than that.