The Journal of Finance (December 2011) published a study of whether the decision to invest in the stock market is dependent on IQ. Information on a sample of 158,044 adults living in Finland formed the database for the study. An IQ score (from a low score of 1 to a high score of 9) was determined for each Finnish citizen as well as whether or not the citizen invested in the stock market. The next table gives the number of Finnish citizens in each IQ score/investment category. Suppose one of the 158,044 citizens is selected at random.
a. What is the probability that the Finnish citizen invests in the stock market?
b. What is the probability that the Finnish citizen has an IQ score of 6 or higher?
c. What is the probability that the Finnish citizen invests in the stock market and has an IQ score of 6 or higher?
d. What is the probability that the Finnish citizen invests in the stock market or has an IQ score of 6 or higher?
e. What is the probability that the Finnish citizen does not invest in the stock market?
f. Are the events {Invest in the stock market} and {IQ score of 1} mutually exclusive?

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Invest in Market No Investment IQ Score 893 1.340 2,009 5,358 8,484 10.270 6,698 5,135 4,464 4,659 9,409 9,993 19,682 24,640 21,673 11.260 7010 5,067 5,552 10,749 12,002 25,040 33,124 31,943 17958 12,145 9,531 Totals 44,651 113,393 158,044