標題:
Mathematics Problems
發問:
1)(a) There are 2000 $1,$2 and $5 coins in a money-box. 100 coins are drawn at random from the box, and 20 $1 coins, 32 $2 coins and 48$ 5 coins are obtained.(a) Caluculate the experimetal probability of drawing each kind of coins.(b) From the result obtained in (a), estimate the number of each kind of coins... 顯示更多 1)(a) There are 2000 $1,$2 and $5 coins in a money-box. 100 coins are drawn at random from the box, and 20 $1 coins, 32 $2 coins and 48$ 5 coins are obtained. (a) Caluculate the experimetal probability of drawing each kind of coins. (b) From the result obtained in (a), estimate the number of each kind of coins and the total amount of the coins in the money-box. 2) A survey was conducted outside a polling station in a country. Among 150 voters selected at random, 66 replied that they had voted for the candidate from Labour Parry. If there were about 4 million voters in the country, estimate the number of voters who had voted for the Labour Party candidate. nedd steps,plz!
最佳解答:
1. (a) The experimental probability of drawing $1 coin = 20/100 = 0.2 The experimental probability of drawing $2 coin = 32/100 = 0.32 The experimental probability of drawing $5 coin = 48/100 = 0.48 (b) Estimate number of $1 coins = 2000 × 0.2 = 400 Estimate number of $2 coins = 2000 × 0.32 = 640 Estimate number of $5 coins = 2000 × 0.48 = 960 Total amount of the coins in the money-box = $(1 × 400 + 2 × 640 + 5 × 960) = $6 480 ==== 2. Experimental probability of voter who had voted for the Labour Party candidate = 66/150 = 0.44 Estimate number of voters who had voted for the Labour Party candidate = 4 000 000 × 0.44 = 1 760 000
Mathematics Problems
發問:
1)(a) There are 2000 $1,$2 and $5 coins in a money-box. 100 coins are drawn at random from the box, and 20 $1 coins, 32 $2 coins and 48$ 5 coins are obtained.(a) Caluculate the experimetal probability of drawing each kind of coins.(b) From the result obtained in (a), estimate the number of each kind of coins... 顯示更多 1)(a) There are 2000 $1,$2 and $5 coins in a money-box. 100 coins are drawn at random from the box, and 20 $1 coins, 32 $2 coins and 48$ 5 coins are obtained. (a) Caluculate the experimetal probability of drawing each kind of coins. (b) From the result obtained in (a), estimate the number of each kind of coins and the total amount of the coins in the money-box. 2) A survey was conducted outside a polling station in a country. Among 150 voters selected at random, 66 replied that they had voted for the candidate from Labour Parry. If there were about 4 million voters in the country, estimate the number of voters who had voted for the Labour Party candidate. nedd steps,plz!
最佳解答:
1. (a) The experimental probability of drawing $1 coin = 20/100 = 0.2 The experimental probability of drawing $2 coin = 32/100 = 0.32 The experimental probability of drawing $5 coin = 48/100 = 0.48 (b) Estimate number of $1 coins = 2000 × 0.2 = 400 Estimate number of $2 coins = 2000 × 0.32 = 640 Estimate number of $5 coins = 2000 × 0.48 = 960 Total amount of the coins in the money-box = $(1 × 400 + 2 × 640 + 5 × 960) = $6 480 ==== 2. Experimental probability of voter who had voted for the Labour Party candidate = 66/150 = 0.44 Estimate number of voters who had voted for the Labour Party candidate = 4 000 000 × 0.44 = 1 760 000
此文章來自奇摩知識+如有不便請留言告知
其他解答:
文章標籤
全站熱搜
留言列表
