Để so sánh tỷ lệ nuôi sống đến hai tháng tuổi của gà Đông tảo và gà Hồ người ta theo dõi 200 con gà Đông tảo thấy có 170 con sống và theo dõi 300 con gà Hồ thấy có 246 con sống. Với mức ý nghĩa 5% có thể cho rằng tỷ lệ nuôi sống đến hai tháng tuổi của hai giống gà này là như nhau không? Tính Zt

Reflect the point (7,0) across the y-axis

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Kendra had twice as much money as kareem. kendra later spent $8 and kareem earned $6. by then,the two had the same amount of money. how much money did each have originally?