In a statistics study, the number of column inches of classified advertisements appearing on Sundays in a certain newspaper is normally distributed with population mean of 320 and standard deviation of 20 inches. For a randomly chosen Sunday, determine: (a) The probability there will be more than 340 column inches of classified advertisement. (b) The probability there will be between 285 and 370 column inches of classified advertisement. (c) The value of number of column inches with less than the probability of 0.3