một tổ có 4 học sinh nữ và 6 học sinh nam . chọn ngẫu nhiên 1 học sinh. gọi X là ngẫu nhiên 1 học sinh nữ được chọn. tính phương sai của X+ 2021

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer