Korner Hardware manager Emerson Jones is interested in verifying how many nativity scenes to order for the 12-day holiday season. Past experience points out that demand for such nativity scenes averages nine for each day throughout this 12-day period, with the standard deviation of 3 per day. Demand is approximately normal. Emerson buys the nativity scenes for $24 per unit and sells them for $48 each throughout the season. After Christmas, they’re marked down as sale items for $16 each.
How many units must Emerson order for coming holiday season?