Private colleges and universities rely on money contributed by individuals and corporations for their operating expenses. Much of this money is put into a fund called an endowment, and the college spends only the interest earned by the fund. A recent survey of 8 private colleges in the United States revealed the following endowments (in millions of dollars): 60.2.47.0.235.1.490.0.122.6.177.5. 95.4. and 220.0. Summary statistics yield: Sample mean - 180.975 Sample standard deviation - 143.042 Calculate a 95% confidence interval for the mean endowment of all the private cabbages in the United States assuming a normal distribution for the endowments. a. $180, 975 plusminus $119.585 b. $180, 975 plusminus $116.621 c. $180.975 plusminus $94, 066 d. $180, 975 plusminus $99, 123