The gmac insurance company reported that the mean score on the national drivers test was 69.9 with a standard deviation of 3.7 points. the test scores are approximately bell-shaped. approximately 68% of all test scores were between two values a and b. what is the value of a? write only a number as your answer. round to one decimal place.

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0