It is estimated % of all adults in united states invest in stocks and that % of u. s. adults have investments in fixed income instruments (savings accounts, bonds, it is also estimated that % of u. s. adults have investments in both stocks and fixed income instruments. (a) what is the probability that a randomly chosen stock investor also invests in fixed income instruments? round your answer to decimal places. (b) what is the probability that a randomly chosen u. s. adult invests in stocks, given that s/he invests in fixed income instruments?