The width of bolts of fabric is normally distributed with mean 951 mm (millimeters) and standard deviation 10 mm. (a) What is the probability that a randomly chosen bolt has a width between 941 and 959 mm

Ineed with number 17 i don’t get it at alll

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.

What is the solution set of the quadratic inequality x^2-5< or equal to 0