Question

the following table lists the ages and number of players per age group that are on a baseball team. Let A= baseball players who are younger than 9 years oldhow many players are in the complement of A?

Answer 1

Given the table as shown in the question

We let A = baseball players who are younger than 9 years old

We want to find

$n(A^c)$

I.e The cardinality of A complement

Solution

From the table, it is clear that

$n(A)=8+3=11$

Therefore,

$n(A^c)=4+2=6$

Therefore, the number of players in the complement of A is 6