Refer to the Applied Ecology and Environmental Research (Vol. 1, 2003) study of beech trees damaged by fungi, presented in Exercise. The researchers found that 25% of the beech trees in east central Europe had been damaged by fungi. Consider a sample of 20 beech trees from this area.
a. What is the probability that fewer than half are dam-aged by fungi?
b. What is the probability that more than 15 are damaged by fungi?
c. How many of the sampled trees would you expect to be damaged by fungi?