Two​ trains, Train A and Train​ B, weigh a total of 269 tons. Train A is heavier than Train B. The difference of their weights is 131 tons. What is the weight of each​ train

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm2. what is the area of the second triangle?