According to the U.S. Census Bureau, the following table gives the probability distribution that a randomly chosen nonfamily household in the United States in 2016 has Y members. A nonfamily house-hold is where people live alone or share a residence with unrelated individuals. 

a. Calculate P(Y = 3 or 4) and describe what it means. 

b. What is P(Y ≤ 3) and describe what it means. 

c. What is P(Y < 4) and describe what it means.

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2 3 0.8110 0.1536 0.0242 y 1 р(y) 0.8110 4 5 0.0081 0.0023 6 0.0003 7 0.0004