(Solved): Example \& 13: A lottery offers one $1000 prize, one $500 prize, and five $100 prizes. One thou ...

Example \& 13: A lottery offers one $\$1000$ prize, one $\$500$ prize, and five $\$100$ prizes. One thousand tickets are sold at $\$3$ cach. Find the exnectation if a nerson huvs one ticket. Example \# 14: A ski resort loses $\$70,000$ per season when it does not snow very much and makes $\$250,000$ profit when it does snow a lot. The probability that it will snow at least 75 " (it means a good season) is $40\%$. Find the expectation for the profit.