4. A subject performance has a normal distribution with a mean of 65 marks and standard deviation of 10 marks. Find the probability of each of the following: (a) passing rate where 50 is the passing mark. (h) marginal and provisional passing grade between 40 and 49. The marks of a candidate in statistics examination are normally distributed with a mean of 55 and a standard deviation of 3. Find the probability that a candidate chosen at random get marks. (a) more than 70 marks. (b) between 60 and 7'0. McDee sells many types of soft drinks. including Cole. The amount of soda in each cup of large size Cote has a normal distribution with a mean of 17 ounces and a standard deviation of 0.3 ounce. (a) Find the probability that a randomly selected cup of Cote contains 16.9 to 1?.1 ounces of soda. (b) Find the probability that the Cote cups contain 16.5 to 17.5 ounces of soda