4, (16 pts) A certain species of fish in Lake Watchamacallit has a weight which is normally distributed, with mean yu = 2 kg and standard deviation o = 0.3 kg. Fred's boat can hold a maximum weight of 500 kg of fish; any more and the boat sinks. What 1s the maximum number of fish that Fred can catch, so that the probability of his boat sinking is no more than 0.05