One theory concerning the S &P 500 Index is that if it increases during the first five trading days of the year, it is likely to increase during the entire year. From 1950 through 2014, the S&P 500 Index had these early gains in 42 years (in 2011 there was virtually no change). In 37 of these years, 42 years, the S&P 500 Index increased for the entire year. Assuming that this indicator is random event with no predictive value, you would expect that the indicator would be correct 50% of the time. What is the probability of the S&P 500 Index increasing in 37 or more years if the true probability of an increase in the S&P 500 Index is

a. 0.50 

b. 0.70

c. 0.90

d. Based on the results of (a) through (c), what do you think is the probability that the S&P 500 Index will increase if there is an early gain in the first five trading days of the year? Explain.