The mass of a packet of biscuits is normally distributed with a mean of 125g and a variance of 16g. a. Find the probability that a packet of biscuits chosen at random from a sample will have mass between 123g and 127g. (3 MARKS) b. If 70% of the packets of biscuits chosen at random have masses less than M nd the value of M(3 MARKS) 0. Thirty packets of biscuits are randomly selected. Write down the sampling distribution of the mean mass and nd the probability that the mean mass is less than 126g. (4 MARKS)