Solution of problem N1472 Laplace probability theory

1472. On the basis of stored 760 units. products. The probability that it will not deteriorate is 0.65. Find the probability that:
a) Will not spoil 495 units. products;
b) the number of spoiled items will be less than 282;
c) the relative frequency of the event, consisting in the fact that the product does not deteriorate, deviates from its probability in absolute value by no more than 0.01.