6 The masses, in grams, of small and large bags of flour have the distributions \(\mathrm { N } ( 510,100 )\) and \(\mathrm { N } ( 1015,324 )\) respectively. André selects 4 small bags of flour and 2 large bags of flour at random.

1. Find the probability that the total mass of these 6 bags of flour is less than 4130 g .
2. Find the probability that the total mass of the 4 small bags is more than the total mass of the 2 large bags.