1. The weight, in liters, of a type of detergent in bottle is normally distributed with mean 4.5 liters and standard deviation 0.25 liters. What is the probability that a random sample of 12 bottles of detergent will have a mean weight less than 4.45 liters? (4 m)

2. Past records of a hypermarket show that 5% of the pineapples sold are rotten. What is the probability that in a random sample of 150 pineapples, less than 8% are rotten? (4 m)

3. The table below shows the mass of a random sample of six packets of flour produced by a factory.

450 452 448 449 450 451