PSAT Math Multiple-Choice Practice Question 780

Question: 780

The table below gives the results of a survey of a randomly selected sample of 400 individuals who are 15 and 16 years old. Each respondent selected the method of electronic communication that he or she used the most. 
Primary Method of Electronic Communication
Texting
E-mail
Video Chatting
Other
Total
15-year-olds
110
20
40
30
200
16-year-olds
85
45
30
40
200
Total
195
x
70
70
400

What is the best estimation of the probability that a randomly selected 16-year-old from the sample would use texting as his or her primary method of electronic communication?

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