Edgar uses 5/8 of a cup of vinegar in his salad dressing recipe, how much vinegar would edgar use to make 1/2 of a recipe?

What is a rational number between 9.5 and 9.7

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

{0,1,2,3,4,5,6,20,21,22,23,24,25} the distribution is considered to be: skewed the right, skewed the left, not skewed?