The Hope club had a fundraising raffle where they sold 3865 tickets for \( \$ 3 \) each. There was one first place prize worth \( \$ 955 \) and 4 second place prizes each worth \( \$ 10 \). The expected value can be computed by: \( E V=\frac{955+(10)(4)+(-3)(3865-1-4)}{3865} \) Find this expected value rounded to two decimal places (the nearest cent).
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The Deep Dive
To calculate the expected value (EV), we first need to understand the components. The total prizes amount to \( \$ 955 + (4 \times \$ 10) = \$ 955 + \$ 40 = \$ 995 \). Now, let's address the losses. The total number of tickets sold is 3865, and each ticket costs \( \$ 3 \), so the total revenue from tickets sold is \( 3 \times 3865 = \$ 11,595 \). The expected value formula provided can be calculated as follows: \[ EV = \frac{995 + (-3)(3865 - 1 - 4)}{3865} \] This simplifies to: \[ EV = \frac{995 - 3(3860)}{3865} \] \[ = \frac{995 - 11580}{3865} = \frac{-10585}{3865} \approx -2.74 \] Rounded to two decimal places, the expected value is approximately \( -2.74 \). This negative value suggests that on average, participants lose \( \$ 2.74 \) for every ticket purchased.