:3.  A box contains 10,000 flower seeds.  Each seed is known to
grow either a white flower or a red flower.  Four hundred seeds
are drawn at random without replacement and are sown; 121 are
observed to produce white flowers.  A 70% confidence interval for
the percentage of white flower seeds in the box is best given as
being <p>

a. between 28% and 32%  <p>

b. between 20% and 40%  <p>

c. between 25% and 35%  <p>

d. between 0% and 75%