Bài : Đo chỉ số mỡ sữa x ( tính theo %) của 130 bà mẹ sinh con ta được bảng số liệu: Tìm các tham số của mẫu: Mod(X); 2 2 2 X ; X ; S ; S ;S ' ; S ' x x x x Chỉ số mỡ sữa dưới 4,2 thuộc loại tốt . Hãy tỉ lệ ft chỉ số mỡ sữa tốt với độ tin cậy 98%. Bài làm Chỉ số [3,0 – 3,6) [3,6 – 4,2) [4,2 – 4,8) [4,8 – 5,4) [5,4 – 6,0) [6,0 – 6,6) [6,6 – 7,2) mỡ sữa Số bà mẹ 2 8 35 43 22 15 5

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?

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations

Write the factored form of this trinomial 9x^2+18x-7