The table below gives beverage preferences for random samples of teens and adults. Beverage Teens Adults Total Coffee 60 190 250 Tea 50 160 210 Soft drink 150 150 300 Other   120   120    240   380 620 1,000

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The table below gives beverage preferences for random samples of teens and adults.

Beverage Teens Adults Total
Coffee 60 190 250
Tea 50 160 210
Soft drink 150 150 300
Other   120   120    240
  380 620 1,000

We are asked to test for independence between age (i.e., adult and teen) and drink preferences.

If age and drink preference is independent then the expected number of adults who prefer coffee would be _____.

  a. 0.50  
  b. 0.41  
  c. 190  
  d. 155  
 
 
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