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Use the table for A(z) to find the area of the shaded region under the standard normal curve. Z A(z) -0.5 0.3085 0.9772 Pr( - 0.5 sZs2) = -1.17705 The table summarizes the number of degrees awarded in statistics at two University A University B universities during the past 13 years. For example, two degrees were awarded at Number Number University A during 2 of the last 13 years. of Number of Number Degrees of Years Degrees of Years 4 QUIAWN NOAUIN NOIN (a) Find the population mean and standard deviation for the number of degrees awarded each year at each university. The mean for University A is approximately (Type an integer or decimal rounded to the nearest hundredth as needed.) For a certain type of light, the number of hours a bulb will burn before requiring replacement has a mean of 4000 hours and a standard deviation of 200 hours. Suppose that 5000 such bulbs are installed in an office building. Estimate the number that will require replacement between 3600 and 4400 hours from the time of installation. At least bulbs will require replacement between 3600 and 4400 hours from the time of installation. (Round to the nearest whole number as needed.)