It is believed that approximately 75% of american youth now have insurance due to the health care law. suppose this is true, and let x equal the number of american youth in a random sample of n = 15 with private health insurance. (a) how is x distributed? (b) find the probability that x is at least 10. (c) find the probability that x is at most 10. (d) find the probability that x is equal to 10. (e) give the mean, variance, and standard deviation of x

I've been working on this for a few days and i just don't understand, it's due in a few hours. you. the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α. part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part b suppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case. part c now try a numerical problem. what is the direction of the vector w = < -1, 6 > ?