Samsung got a good deal on 400 phones. 250 of these phones have 5" screens and the rest have 4" screens. of the 5" screens 140 are silver and the rest are black. out of the 4" screens 80 are silver and the rest are black. if one phone is randomly picked out for a customer. what is the probability that it will: a) be silver or have 5" screen
b) be black or have 4" screen

Acompany produces packets of soap powder labeled “giant size 32 ounces.” the actual weight of soap powder in such a box has a normal distribution with a mean of 33 oz and a standard deviation of 0.7 oz. to avoid having dissatisfied customers, the company says a box of soap is considered underweight if it weighs less than 32 oz. to avoid losing money, it labels the top 5% (the heaviest 5%) overweight. how heavy does a box have to be for it to be labeled overweight?