The time taken by people to fill a survey form follow a normal distribution with a mean of 100 minutes and a standard deviation of 30 minutes. Two persons are chosen at random. The probability that both of them take longer than an hour to complete this form is:

a.0.1752

b.0.9082

c.0.8248

d.1.8164.

2)A firm produces an item and 5% of the items produced have some defect. Six items, whose characteristics can be assumed to be independent of each other are examined. The probability that at least two of these components have a defect is:

a.0.03054

b.0.81451

c.0.32450

d.0.00224