Find the mean of the random variable with the given pdf. 
Definitions:
Expense Ratio
The annual fee that mutual funds, index funds, and ETFs charge their shareholders, expressed as a percentage of the fund's average net assets.
NAV
NAV, or Net Asset Value, is the per-share value of a mutual fund or an exchange-traded fund (ETF), calculated by dividing the total value of all the securities in the portfolio, minus any liabilities, by the number of shares outstanding.
Mutual Fund
A financial instrument that pools money from various investors to invest in different types of securities, including stocks, bonds, money market instruments, and additional assets.
New York Time
The time zone observed in New York, typically Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on the time of year.
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