statistics, question 1, grade 10
A teacher examined 25 students in math and gave the results arranged in the following table:
- Calculate x and y knowing that 17 students got at least 15 and the class average was 15
- Suppose in what follows that x=5 and y=10
a) Determine the mode and the median.
b) Use the calculator to find the standard deviation
c) Find the percentage of students whose grades belong to the given set: