(2)若該蘋果產品的標準差仍維持4公克，欲使其重量超過210公克的機率等於 5% ，則平均重量應訂為__________。

2. Assuming a competitive market in the U.S., together with a supply function: $ q{s} = 400p - 400 $ and a demand function: $ q{d} = 2400 - 400p $. When the equilibrium price and quantity are reached, what are equilibrium price and quantity? (10%). Now due to Trump's reciprocal tariff policy, the authorities impose a $4 per-unit tax to be collected from sellers. We denote $ P{c} $ as the price paid by consumers after imposed tax and $ P{s} $ as the price received by producers after tax. Please solve the after-tax equilibrium quantity ($ q^{} $) and equilibrium prices for both consumers $ P{c}^{} $ and sellers $ P{s}^{*} $. (15%)

題組內容

(2)若該蘋果產品的標準差仍維持4公克，欲使其重量超過210公克的機率等於 \( 5\% \) ，則平均重量應訂為__________。

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