Question 1182125
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Table:
<table border = "1" cellpadding = "5"><tr><td></td><td>Response</td><td>No response</td><td>Total</td></tr><tr><td>Age 18 to 21</td><td>65</td><td>11</td><td>76</td></tr><tr><td>Age 22 to 29</td><td>283</td><td>20</td><td>303</td></tr><tr><td>Total</td><td>348</td><td>31</td><td>379</td></tr></table>


Define the two events
A = someone is in the 18-21 age bracket
B = the person does not respond


Based on the table, we have 
n(A) = number of people in set A = 76
n(B) = 31
n(A and B) = 11


So,
n(A or B) = n(A) + n(B) - n(A and B)
n(A or B) = 76+31-11
n(A or B) = 96
We have 96 people in the age 18-21 bracket, they didn't respond, or both.


Divide this over the 379 people surveyed
96/379 = 0.253 = <font color=red>25.3%</font>


Answer: <font color=red>25.3%</font>
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