Thirty companies comprise the DJIA. One common method for measuring the size of a company is to use its market capitalization, which is computed by multiplying the number of stock shares by the price of a share of stock. On June 19, 2009, the market capitalization of these companies ranged from Caterpillar's $20.5 billion to ExxonMobil's $347.4 billion. If 30% of the companies have market capitalization of $100 billion or over and the standard deviation is $25 billion, what is the mean value of market capitalization? Assume that market capitalization has a normal distribution.