Question 1175598
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Hi

a) p(yellow) 156/ 587 = .2657

b) Ho   p = .25 expectations
   Ha   p > .25
{{{z =blue (x - mu)/sqrt(blue(p(1-p)/n))}}}
{{{z =blue (.0157)/sqrt(blue(.25(.75)/587))}}}
   z = .878
  P(z .878) = .81  
  90% confidence Interval. 
  .81 > .10 Fail to reject Ho
 Evidence supports the expectation that μ = .25

Wish You the Best in your Studies.
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