ECON 307 STAT 310 002 Lesson 2.1 Quick Quiz

Let Y have the PMF  𝑝 𝑌 ( 𝑦 ) = 𝑃 ( 𝑌 = 𝑦 ) = 𝑦 10 for y = 1, 2, 3, 4.  What is 𝑃 ( 𝑌 ≤ 2 ) ?