Suppose an airplane engine will fail (when the plane is in flight) with probability 1 - p. Failure of engines are statistically independent events. Suppose, also, that the plane will land successfully if at least half of its engines remain operative. For what values of p is a 4-engine plane preferred to a 2-engine plane (i.e., for what values of p is the probability of a successful landing higher with a 4-engine plane than with a 2-engine plane)?