You are to conduct a sample survey to determine the mean family income in Washington County, Vermont. The question is how many families should be sampled. In a pilot sample of 10 families the standard deviation was equal to $500. If you want to be 95% confident that the estimate of mean family income will lie within $50 of the true level, how many families must you sample.

Ngrid mixes 3.6 pounds of almonds with some raisins to make a trail mix. she divides the trail mix into 12 equal portions. each portion weighs 0.7 pound. how many pounds of raisins did she use to make the trail mix? express the answer to the nearest tenth.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

The cross-sectional areas of a right triangular prism and a right cylinder are congruent. the right triangular prism has a height of 6 units, and the right cylinder has a height of 6 units. which conclusion can be made from the given information? the volume of the triangular prism is half the volume of the cylinder. the volume of the triangular prism is twice the volume of the cylinder. the volume of the triangular prism is equal to the volume of the cylinder. the volume of the triangular prism is not equal to the volume of the cylinder.