The table below summarizes results from a study of people wh

The table below summarizes results from a study of people who REFUSED to answer survey questions. A pharmaceutical company is interested in opinions of the elderly.

What is the probablility that the selected subject is someone 60 and over WHO RESPONDED?

Responded Refused

18-21 73 11

22-29 255 20

30-39 245 33

40-49 136 26

50-59 138 35

60 and over 202 57   

The probability that the selected subject is someone 60 and over who responded is ----------

Round to 3 decimals

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Solution

The table below summarizes results from a study of people who REFUSED to answer survey questions. A pharmaceutical company is interested in opinions of the elderly.

What is the probability that the selected subject is someone 60 and over WHO RESPONDED?

Responded

Refused

Total

18-21

73

11

84

22-29

255

20

275

30-39

245

33

278

40-49

136

26

162

50-59

138

35

173

60 and over

202

57

259

Total

1049

182

1231

someone 60 and over WHO RESPONDED =202

total=1231

probability that the selected subject is someone 60 and over WHO RESPONDED

=202/1231

= 0.164

The probability that the selected subject is someone 60 and over who responded is 0.164

	Responded	Refused	Total
18-21	73	11	84
22-29	255	20	275
30-39	245	33	278
40-49	136	26	162
50-59	138	35	173
60 and over	202	57	259
Total	1049	182	1231