A vegetable distributor knows that during the month of August, the weights of its tomatoes are normally distributed with a mean of 0.54 lb and a standard deviation of 0.15 lb. (See Example 2 in this section.) (a) What percent of the tomatoes weigh less than 0.69 lb? % (b) In a shipment of 8,000 tomatoes, how many tomatoes can be expected to weigh more than 0.24 lb? tomatoes (c) In a shipment of 4,500 tomatoes, how many tomatoes can be expected to weigh from 0.24 lb to 0.84 lb?