A type of light bulbs has a normally distributed output with mean 2,000 fe and standard deviation 80 fc. (a) What is the probability that a bulb has an output between 1,950 fe and 2,030 fc? (b) What lower specification limit L fe can we set so that 95 percent of the bulbs produced will be above this limit? For each question, give an exact expression in terms of the CDF 4 of (0, 1) and an approximate decimal value (2 digits after the decimal point)