1. The following are the scores of students in a Mathematics Quiz. 22, 12, 18, 15, 20, 9, 13, 22, 28. Find the mean, mode, Q₁, Q2, and Q3

2. given the ages of teachers in the mathematics department 28, 32, 47, 48, 36, 42,50, 31, 35,43,38, 33 find D²D⁶andD⁹.​

3.the following data show the number of typhoons which visited the country for the past years.30,37, 39, 37, 35, 28, 38, 33, 34,29.find P¹⁰,P⁴⁵,P⁷³​